diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5219163..1916bfb 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -81,6 +81,17 @@ jobs:
           target: gpscorrelate
           install_target: install
           valgrind: yes
+        - name: 'locale tests'
+          cc: gcc
+          gtk: 3
+          install: desktop-file-utils docbook-xsl exiv2 libexiv2-dev libgtk-3-dev xsltproc gettext locales-all
+          cflags: -Wall -Wextra -Werror -Wno-error=deprecated-declarations -O3 -DENABLE_NLS=1
+          cxx: g++
+          target: all
+          install_target: install install-po install-desktop-file
+          # Turkish is one of the better locales to test in that it has unusual
+          # upper/lowercase folding and comma as decimal separator.
+          locale: tr_TR
 
     steps:
     - uses: actions/checkout@v4
@@ -103,6 +114,23 @@ jobs:
     - if: matrix.build.valgrind == 'yes'
       name: 'valgrind test'
       run: make check CHECK_OPTIONS='-v -m'
+    - if: matrix.build.locale
+      name: 'locale test'
+      env:
+        LC_ADDRESS: ${{ matrix.build.locale }}
+        LC_COLLATE: ${{ matrix.build.locale }}
+        LC_CTYPE: ${{ matrix.build.locale }}
+        LC_IDENTIFICATION: ${{ matrix.build.locale }}
+        LC_MEASUREMENT: ${{ matrix.build.locale }}
+        LC_MESSAGES: ${{ matrix.build.locale }}
+        LC_MONETARY: ${{ matrix.build.locale }}
+        LC_NAME: ${{ matrix.build.locale }}
+        LC_NUMERIC: ${{ matrix.build.locale }}
+        LC_PAPER: ${{ matrix.build.locale }}
+        LC_SOURCED: ${{ matrix.build.locale }}
+        LC_TELEPHONE: ${{ matrix.build.locale }}
+        LC_TIME: ${{ matrix.build.locale }}
+      run: make check CHECK_OPTIONS='-v'
     - name: 'install test'
       run: make prefix= DESTDIR="${PWD}" ${{ matrix.build.install_target }}
 
diff --git a/tests/data/test018.param b/tests/data/test018.param
index fb128b5..4afbdb3 100644
--- a/tests/data/test018.param
+++ b/tests/data/test018.param
@@ -1,5 +1,5 @@
 TITLE='Show GPS data on file'
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C $PROGRAM -s "$STAGINGDIR/withgps.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -s "$STAGINGDIR/withgps.jpg" > "$OUTFILE" 2>&1'
 RESULTCODE=0
 SEDCOMMAND='s@^.*/@@' # strip path
diff --git a/tests/data/test038.param b/tests/data/test038.param
index 29f9344..4181e32 100644
--- a/tests/data/test038.param
+++ b/tests/data/test038.param
@@ -3,7 +3,7 @@ PRECOMMAND='cat "$STAGINGDIR/point2-1.jpg" >"$LOGDIR/test.jpg"'
 # This time zone is equivalent to America/Vancouver (at least, in 2012)
 # but should be more portable than using the symbolic name.
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C TZ="PST8PDT,M3.2.0,M11.1.0" $PROGRAM -v -g "$STAGINGDIR/track4.gpx" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C TZ="PST8PDT,M3.2.0,M11.1.0" $PROGRAM -v -g "$STAGINGDIR/track4.gpx" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
 SEDCOMMAND='s@^/.*/|.*Copyright.*$@@' # strip path and copyright line
diff --git a/tests/data/test039.param b/tests/data/test039.param
index 3d587a2..1bcbac6 100644
--- a/tests/data/test039.param
+++ b/tests/data/test039.param
@@ -3,7 +3,7 @@ PRECOMMAND='cat "$STAGINGDIR/point2-2.jpg" >"$LOGDIR/test.jpg"'
 # This time zone is equivalent to America/Vancouver (at least, in 2012)
 # but should be more portable than using the symbolic name.
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C TZ="PST8PDT,M3.2.0,M11.1.0" $PROGRAM -v -g "$STAGINGDIR/track4.gpx" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C TZ="PST8PDT,M3.2.0,M11.1.0" $PROGRAM -v -g "$STAGINGDIR/track4.gpx" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
 SEDCOMMAND='s@^/.*/|.*Copyright.*$@@' # strip path and copyright line
diff --git a/tests/data/test040.param b/tests/data/test040.param
index ac74e33..a317219 100644
--- a/tests/data/test040.param
+++ b/tests/data/test040.param
@@ -3,7 +3,7 @@ PRECOMMAND='cat "$STAGINGDIR/point7-1.jpg" >"$LOGDIR/test.jpg"'
 # This time zone is equivalent to America/Vancouver (at least, in 2012)
 # but should be more portable than using the symbolic name.
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C TZ="PST8PDT,M3.2.0,M11.1.0" $PROGRAM -v -g "$STAGINGDIR/track5.gpx" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C TZ="PST8PDT,M3.2.0,M11.1.0" $PROGRAM -v -g "$STAGINGDIR/track5.gpx" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
 SEDCOMMAND='s@^/.*/|.*Copyright.*$@@' # strip path and copyright line
diff --git a/tests/data/test042.param b/tests/data/test042.param
index 8dca0a6..60a0d04 100644
--- a/tests/data/test042.param
+++ b/tests/data/test042.param
@@ -1,7 +1,7 @@
 TITLE='Correlate a file with --timeadd west of UTC and aligned on the half hour'
 PRECOMMAND='cat "$STAGINGDIR/point3-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C $PROGRAM --timeadd -3:30 -v -g "$STAGINGDIR/track6.gpx" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM --timeadd -3:30 -v -g "$STAGINGDIR/track6.gpx" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
 SEDCOMMAND='s@^([a-zA-Z]:)?/.*/|.*Copyright.*$@@' # strip path and copyright line
diff --git a/tests/data/test043.param b/tests/data/test043.param
index 167bd65..babb7d5 100644
--- a/tests/data/test043.param
+++ b/tests/data/test043.param
@@ -1,7 +1,7 @@
 TITLE='Correlate a file with --timeadd east of UTC'
 PRECOMMAND='cat "$STAGINGDIR/point4-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C $PROGRAM --timeadd 1:00 -v -g "$STAGINGDIR/track2.gpx" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM --timeadd 1:00 -v -g "$STAGINGDIR/track2.gpx" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
 SEDCOMMAND='s@^([a-zA-Z]:)?/.*/|.*Copyright.*$@@' # strip path and copyright line
diff --git a/tests/data/test044.param b/tests/data/test044.param
index 189a77e..6347fe3 100644
--- a/tests/data/test044.param
+++ b/tests/data/test044.param
@@ -1,7 +1,7 @@
 TITLE='Fix a bad GPS date with --fix-datestamps'
 PRECOMMAND='cat "$STAGINGDIR/baddate.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to avoid errors when comparing days of week in output
-COMMAND='env LC_ALL=C $PROGRAM --fix-datestamps -z -7 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1 && $PROGRAM --fix-datestamps -z -7 "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_TIME=C $PROGRAM --fix-datestamps -z -7 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1 && $PROGRAM --fix-datestamps -z -7 "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
 SEDCOMMAND='s@^([a-zA-Z]:)?/.*/@@' # strip path
diff --git a/tests/data/test051.param b/tests/data/test051.param
index 6ab2190..b46b973 100644
--- a/tests/data/test051.param
+++ b/tests/data/test051.param
@@ -1,7 +1,7 @@
 TITLE='Fix a bad GPS date with --fix-datestamps on a read-only file'
 PRECOMMAND='cat "$STAGINGDIR/baddate.jpg" >"$LOGDIR/test.jpg" && chmod a-w "$LOGDIR/test.jpg"'
 # Run in C locale to avoid errors when comparing days of week in output
-COMMAND='env LC_ALL=C $PROGRAM --fix-datestamps -z -7 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_TIME=C $PROGRAM --fix-datestamps -z -7 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=1
 SEDCOMMAND='1s@^.*/@@' # strip path
diff --git a/tests/data/test054.param b/tests/data/test054.param
index deb7565..56c0d2f 100644
--- a/tests/data/test054.param
+++ b/tests/data/test054.param
@@ -1,7 +1,7 @@
 TITLE='Correlate many files, with a write failure'
 PRECOMMAND='for f in baddate.jpg noexif.jpg notime.jpg point1-1.jpg point1-2.jpg point2-1.jpg point2-2.jpg point7-1.jpg point3-1.jpg point4-1.jpg withgps.jpg; do cat "$STAGINGDIR/$f" >"$LOGDIR/test-$f"; done && chmod a-w "$LOGDIR/test-point1-2.jpg"'
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C $PROGRAM --verbose -t -z 0 -g "$STAGINGDIR/track3.gpx" "$LOGDIR"/test-baddate.jpg "$LOGDIR"/test-noexif.jpg "$LOGDIR"/test-notime.jpg "$LOGDIR"/test-point1-1.jpg "$LOGDIR"/test-point1-2.jpg "$LOGDIR"/test-point2-1.jpg "$LOGDIR"/test-point2-2.jpg "$LOGDIR"/test-point7-1.jpg "$LOGDIR"/test-point3-1.jpg "$LOGDIR"/test-point4-1.jpg "$LOGDIR"/test-withgps.jpg > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM --verbose -t -z 0 -g "$STAGINGDIR/track3.gpx" "$LOGDIR"/test-baddate.jpg "$LOGDIR"/test-noexif.jpg "$LOGDIR"/test-notime.jpg "$LOGDIR"/test-point1-1.jpg "$LOGDIR"/test-point1-2.jpg "$LOGDIR"/test-point2-1.jpg "$LOGDIR"/test-point2-2.jpg "$LOGDIR"/test-point7-1.jpg "$LOGDIR"/test-point3-1.jpg "$LOGDIR"/test-point4-1.jpg "$LOGDIR"/test-withgps.jpg > "$OUTFILE" 2>&1'
 POSTCOMMAND='for f in baddate.jpg noexif.jpg notime.jpg point1-1.jpg point1-2.jpg point2-1.jpg point2-2.jpg point7-1.jpg point3-1.jpg point4-1.jpg withgps.jpg; do rm -f "$LOGDIR/test-$f"; done'
 RESULTCODE=1
 SEDCOMMAND='s@^([a-zA-Z]:)?/.*/|.*Copyright.*$@@' # strip path and copyright line
diff --git a/tests/data/test059.param b/tests/data/test059.param
index 1f1fbf8..095a89b 100644
--- a/tests/data/test059.param
+++ b/tests/data/test059.param
@@ -1,5 +1,5 @@
 TITLE='Show GPS data on file with negative elevation'
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C $PROGRAM -s "$STAGINGDIR/point1-3.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -s "$STAGINGDIR/point1-3.jpg" > "$OUTFILE" 2>&1'
 RESULTCODE=0
 SEDCOMMAND='s@^.*/@@' # strip path
diff --git a/tests/data/test060.param b/tests/data/test060.param
index af67dd6..02518c5 100644
--- a/tests/data/test060.param
+++ b/tests/data/test060.param
@@ -12,7 +12,7 @@ TITLE='Test that --no-mtime is implied by --fix-datestamps'
 # result, so they should not disrupt operation of the test suite.
 PRECOMMAND='cat "$STAGINGDIR/baddate.jpg" >"$LOGDIR/test.jpg" && touch -t 201001020304.05 "$LOGDIR/test.jpg" && touch "$LOGDIR/ztest.jpg"'
 # Run in C locale to avoid errors when comparing days of week in output
-COMMAND='env LC_ALL=C $PROGRAM --fix-datestamps -z -7 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && ls -t "$LOGDIR/ztest.jpg" "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_TIME=C $PROGRAM --fix-datestamps -z -7 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && ls -t "$LOGDIR/ztest.jpg" "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg" "$LOGDIR/ztest.jpg"'
 RESULTCODE=0
 SEDCOMMAND='s@([a-zA-Z]:)?/[^ ].*/@@' # strip paths
diff --git a/tests/data/test063.param b/tests/data/test063.param
index 7debb40..1294eaa 100644
--- a/tests/data/test063.param
+++ b/tests/data/test063.param
@@ -2,7 +2,7 @@ TITLE='Show GPS data on file in southern hemisphere'
 # Synthesize an appropriate file on which the run the real test
 PRECOMMAND='cat "$STAGINGDIR/point5-1.jpg" >"$LOGDIR/test.jpg" && $PROGRAM -z -14:00 -g "$STAGINGDIR/track7.gpx" "$LOGDIR/test.jpg" 2>"$OUTFILE" > /dev/null'
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C $PROGRAM -s "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -s "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
 SEDCOMMAND='s@^.*/@@' # strip path
diff --git a/tests/data/test079.param b/tests/data/test079.param
index fee2405..d4e0d0b 100644
--- a/tests/data/test079.param
+++ b/tests/data/test079.param
@@ -1,7 +1,7 @@
 TITLE='Test --fix-datestamps with --no-write'
 PRECOMMAND='cat "$STAGINGDIR/baddate.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to avoid errors when comparing days of week in output
-COMMAND='env LC_ALL=C $PROGRAM --no-write --fix-datestamps -z -7 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_TIME=C $PROGRAM --no-write --fix-datestamps -z -7 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
 SEDCOMMAND='1s@^.*/@@' # strip path
diff --git a/tests/data/test082.param b/tests/data/test082.param
index 88383b8..68ca564 100644
--- a/tests/data/test082.param
+++ b/tests/data/test082.param
@@ -1,7 +1,7 @@
 TITLE='Fix bad date with --fix-datestamps with corrupt lat/long'
 PRECOMMAND='cat "$STAGINGDIR/baddate2.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to avoid errors when comparing days of week in output
-COMMAND='env LC_ALL=C $PROGRAM --fix-datestamps -z -7 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_TIME=C $PROGRAM --fix-datestamps -z -7 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
 SEDCOMMAND='1s@^.*/@@' # strip path
diff --git a/tests/data/test083.param b/tests/data/test083.param
index cc547b9..7536a39 100644
--- a/tests/data/test083.param
+++ b/tests/data/test083.param
@@ -1,5 +1,5 @@
 TITLE='Show GPS data on file with corrupt lat/long'
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C $PROGRAM -s "$STAGINGDIR/baddate2.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -s "$STAGINGDIR/baddate2.jpg" > "$OUTFILE" 2>&1'
 RESULTCODE=0
 SEDCOMMAND='s@^.*/@@' # strip path
diff --git a/tests/data/test098.param b/tests/data/test098.param
index 651ea37..7151208 100644
--- a/tests/data/test098.param
+++ b/tests/data/test098.param
@@ -1,6 +1,6 @@
 TITLE='Geotag a file from a specified latitude/longitude/elevation'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l 12.34567,123.456,78.9 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l 12.34567,123.456,78.9 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test099.param b/tests/data/test099.param
index bbc4734..958f08f 100644
--- a/tests/data/test099.param
+++ b/tests/data/test099.param
@@ -1,6 +1,6 @@
 TITLE='Geotag a file from a specified latitude/longitude w/o elevation'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l -89.000001,179.9 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l -89.000001,179.9 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test100.param b/tests/data/test100.param
index 34260d9..af8a9ab 100644
--- a/tests/data/test100.param
+++ b/tests/data/test100.param
@@ -4,6 +4,7 @@ PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # present when the UTF-8 degrees symbol is being used, as it is here.
 # As can be seen, it's tricky to pass a single quote character into the test
 # suite.
-COMMAND='env LC_CTYPE=UTF-8 $PROGRAM -z+1 -l -34d56m08.9s,-90°0'"\\'"'59.11111\" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+# Run in C locale to avoid errors when comparing numbers in output
+COMMAND='env LC_CTYPE=UTF-8 LC_NUMERIC=C $PROGRAM -z+1 -l -34d56m08.9s,-90°0'"\\'"'59.11111\" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test101.param b/tests/data/test101.param
index 73a4d74..55b9a55 100644
--- a/tests/data/test101.param
+++ b/tests/data/test101.param
@@ -1,6 +1,6 @@
 TITLE='Geotag a file from a specified latitude/longitude/elevation, space separated'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l 89.9999999\ 179.999\ 99999.999 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l 89.9999999\ 179.999\ 99999.999 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test102.param b/tests/data/test102.param
index c6c4ab2..a1f6adf 100644
--- a/tests/data/test102.param
+++ b/tests/data/test102.param
@@ -1,6 +1,6 @@
 TITLE='Geotag a file from a specified latitude/longitude/elevation, tab separated'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l "-89.9999999	-179.999	-9999.999" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l "-89.9999999	-179.999	-9999.999" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test103.param b/tests/data/test103.param
index 7bc111f..5da6565 100644
--- a/tests/data/test103.param
+++ b/tests/data/test103.param
@@ -1,6 +1,6 @@
 TITLE='Geotag a file from a specified latitude/longitude, tab separated (dms forms)'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l "-89d59m59.9999s	-179d59m059.999s" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l "-89d59m59.9999s	-179d59m059.999s" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test104.param b/tests/data/test104.param
index 7563165..183c1f5 100644
--- a/tests/data/test104.param
+++ b/tests/data/test104.param
@@ -1,6 +1,6 @@
 TITLE='Geotag a file from a specified latitude/longitude, space separated (dms forms)'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l "+89d00m59.0000s +0179d059m059.000s" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l "+89d00m59.0000s +0179d059m059.000s" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test105.param b/tests/data/test105.param
index c4498dd..85224ca 100644
--- a/tests/data/test105.param
+++ b/tests/data/test105.param
@@ -1,6 +1,6 @@
 TITLE='Specify out-of-range latitude'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -l 92.34567,123.456,78.9 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -l 92.34567,123.456,78.9 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=1
diff --git a/tests/data/test107.param b/tests/data/test107.param
index 46c2da0..d2b2268 100644
--- a/tests/data/test107.param
+++ b/tests/data/test107.param
@@ -1,6 +1,6 @@
 TITLE='Specify out-of-range longitude'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -l 92.34567,180.456 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -l 92.34567,180.456 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=1
diff --git a/tests/data/test111.param b/tests/data/test111.param
index e76cbd0..f04d7cf 100644
--- a/tests/data/test111.param
+++ b/tests/data/test111.param
@@ -4,6 +4,7 @@ PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # present when the UTF-8 degrees symbol is being used, as it is here.
 # As can be seen, it's tricky to pass a single quote character into the test
 # suite.
-COMMAND='env LC_CTYPE=UTF-8 $PROGRAM -z+1 -l "-34d 56m 8.9s, -90° 0m 59.11111s 123.4" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+# Run in C locale to avoid errors when comparing numbers in output
+COMMAND='env LC_CTYPE=UTF-8 LC_NUMERIC=C $PROGRAM -z+1 -l "-34d 56m 8.9s, -90° 0m 59.11111s 123.4" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test112.param b/tests/data/test112.param
index 69ea401..9ffff16 100644
--- a/tests/data/test112.param
+++ b/tests/data/test112.param
@@ -4,6 +4,7 @@ PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # present when the UTF-8 degrees symbol is being used, as it is here.
 # As can be seen, it's tricky to pass a single quote character into the test
 # suite.
-COMMAND='env LC_CTYPE=UTF-8 $PROGRAM -z+1 -l "-34d  56  08.9 	 -90°  0m  59.11111\"  -123.4 " "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+# Run in C locale to avoid errors when comparing numbers in output
+COMMAND='env LC_CTYPE=UTF-8 LC_NUMERIC=C $PROGRAM -z+1 -l "-34d  56  08.9 	 -90°  0m  59.11111\"  -123.4 " "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test113.param b/tests/data/test113.param
index d1e4014..8fe3c4c 100644
--- a/tests/data/test113.param
+++ b/tests/data/test113.param
@@ -2,6 +2,7 @@ TITLE='Geotag a file from a specified latitude/longitude (dms form with ISO 8859
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # The degree symbol is in ISO 8859/1 but since it's hard-coded in the program,
 # it's unnecessary to actually be running in an ISO 8859/1 locale to work.
-COMMAND='$PROGRAM -z+1 -l -34d56m08.9s,-90°0'"\\'"'59.11111\" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+# Run in C locale to avoid errors when comparing numbers in output
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l -34d56m08.9s,-90°0'"\\'"'59.11111\" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test117.param b/tests/data/test117.param
index 8b5d229..5011b50 100644
--- a/tests/data/test117.param
+++ b/tests/data/test117.param
@@ -1,5 +1,5 @@
 TITLE='Show GPS data with existing and nonexistent files'
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C $PROGRAM -s "$STAGINGDIR/withgps.jpg" does-not-exist "$STAGINGDIR/withgps.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -s "$STAGINGDIR/withgps.jpg" does-not-exist "$STAGINGDIR/withgps.jpg" > "$OUTFILE" 2>&1'
 RESULTCODE=1
 SEDCOMMAND='s@([a-zA-Z]:)?/.*/@@' # strip path
diff --git a/tests/data/test126.param b/tests/data/test126.param
index 6463f2e..18fe51d 100644
--- a/tests/data/test126.param
+++ b/tests/data/test126.param
@@ -1,5 +1,5 @@
 TITLE='Show GPS data on file with no elevation'
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C $PROGRAM -s "$STAGINGDIR/noelev.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -s "$STAGINGDIR/noelev.jpg" > "$OUTFILE" 2>&1'
 RESULTCODE=0
 SEDCOMMAND='s@^.*/@@' # strip path
diff --git a/tests/data/test127.param b/tests/data/test127.param
index 7734ea9..bb5c66a 100644
--- a/tests/data/test127.param
+++ b/tests/data/test127.param
@@ -1,5 +1,5 @@
 TITLE='Show GPS data on file with no elevation with --machine'
 # Run in C locale to avoid errors when comparing numbers in output
-COMMAND='env LC_ALL=C $PROGRAM -o "$STAGINGDIR/noelev.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -o "$STAGINGDIR/noelev.jpg" > "$OUTFILE" 2>&1'
 RESULTCODE=0
 SEDCOMMAND='s@([a-zA-Z]:)?/.*/@@' # strip path
diff --git a/tests/data/test130.param b/tests/data/test130.param
index 12b3882..e7211e4 100644
--- a/tests/data/test130.param
+++ b/tests/data/test130.param
@@ -1,6 +1,6 @@
 TITLE='Specify unrepresentable latitude'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l 1e10001,1.0,1.0 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l 1e10001,1.0,1.0 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=1
diff --git a/tests/data/test131.param b/tests/data/test131.param
index 03451eb..40956b5 100644
--- a/tests/data/test131.param
+++ b/tests/data/test131.param
@@ -1,6 +1,6 @@
 TITLE='Specify unrepresentable longitude'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l 1.0,1e10001,1.0 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l 1.0,1e10001,1.0 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=1
diff --git a/tests/data/test132.param b/tests/data/test132.param
index a4c0c39..885c903 100644
--- a/tests/data/test132.param
+++ b/tests/data/test132.param
@@ -1,6 +1,6 @@
 TITLE='Specify unrepresentable elevation'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l 1.0,1.0,1e10001 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l 1.0,1.0,1e10001 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=1
diff --git a/tests/data/test133.param b/tests/data/test133.param
index 659c079..fdeda36 100644
--- a/tests/data/test133.param
+++ b/tests/data/test133.param
@@ -1,6 +1,6 @@
 TITLE='Specify invalid elevation'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l 1.0,1.0,bogus "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l 1.0,1.0,bogus "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=1
diff --git a/tests/data/test134.param b/tests/data/test134.param
index 73dc611..d8b90e0 100644
--- a/tests/data/test134.param
+++ b/tests/data/test134.param
@@ -1,6 +1,6 @@
 TITLE='Geotag a file from a specified latitude/longitude/elevation with E notation'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l 12.34567,123.456,7.8e2 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l 12.34567,123.456,7.8e2 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test135.param b/tests/data/test135.param
index 107495c..72876a6 100644
--- a/tests/data/test135.param
+++ b/tests/data/test135.param
@@ -1,6 +1,6 @@
 TITLE='Specify invalid latitude degrees (dms forms)'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l 1Xd2m3s,1d2m3s,1.0 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l 1Xd2m3s,1d2m3s,1.0 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=1
diff --git a/tests/data/test136.param b/tests/data/test136.param
index 1f742c4..e2bbffd 100644
--- a/tests/data/test136.param
+++ b/tests/data/test136.param
@@ -1,6 +1,6 @@
 TITLE='Specify invalid longitude minutes (dms forms)'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l 1d2m3s,1d2Xm3s,1.0 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l 1d2m3s,1d2Xm3s,1.0 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=1
diff --git a/tests/data/test137.param b/tests/data/test137.param
index a6580ae..2add7bb 100644
--- a/tests/data/test137.param
+++ b/tests/data/test137.param
@@ -1,6 +1,6 @@
 TITLE='Specify invalid elevation (dms forms)'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l 1d2Xm3s,1d2m3s,1X.0 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l 1d2Xm3s,1d2m3s,1X.0 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=1
diff --git a/tests/data/test138.param b/tests/data/test138.param
index fc8705b..48e122c 100644
--- a/tests/data/test138.param
+++ b/tests/data/test138.param
@@ -1,6 +1,6 @@
 TITLE='Specify unrepresentable elevation (dms forms)'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l 1d2m3s,1d2m3s,1e10001 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l 1d2m3s,1d2m3s,1e10001 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=1
diff --git a/tests/data/test139.param b/tests/data/test139.param
index 4daba1d..3201ec1 100644
--- a/tests/data/test139.param
+++ b/tests/data/test139.param
@@ -4,6 +4,7 @@ PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # present when the UTF-8 degrees symbol is being used, as it is here.
 # As can be seen, it's tricky to pass a single quote character into the test
 # suite.
-COMMAND='env LC_CTYPE=UTF-8 $PROGRAM -z+1 -l "-34d56m8.9s,-90d0m59s,123.4" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+# Run in C locale to avoid errors when comparing numbers in output
+COMMAND='env LC_CTYPE=UTF-8 LC_NUMERIC=C $PROGRAM -z+1 -l "-34d56m8.9s,-90d0m59s,123.4" "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test171.param b/tests/data/test171.param
index 4492d78..f160449 100644
--- a/tests/data/test171.param
+++ b/tests/data/test171.param
@@ -1,6 +1,6 @@
 TITLE='Geotag a file from a specified location with direction'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z+1 -l 12.34567,-123.456,78.9 --direction 321 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z+1 -l 12.34567,-123.456,78.9 --direction 321 "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0
diff --git a/tests/data/test172.param b/tests/data/test172.param
index 3a2e78f..b4cd544 100644
--- a/tests/data/test172.param
+++ b/tests/data/test172.param
@@ -1,6 +1,6 @@
 TITLE='Geotag a file from a specified location with direction and heading'
 PRECOMMAND='cat "$STAGINGDIR/point1-1.jpg" >"$LOGDIR/test.jpg"'
 # Run in C locale to correctly parse these decimal numbers
-COMMAND='env LC_ALL=C $PROGRAM -z0 --latlong "12.34567,-123.456 78.9" --direction 12 --heading "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
+COMMAND='env LC_NUMERIC=C $PROGRAM -z0 --latlong "12.34567,-123.456 78.9" --direction 12 --heading "$LOGDIR/test.jpg" > "$OUTFILE" 2>&1 && exiv2 -pv pr "$LOGDIR/test.jpg" >> "$OUTFILE" 2>&1'
 POSTCOMMAND='rm -f "$LOGDIR/test.jpg"'
 RESULTCODE=0