diff --git a/Makefile b/Makefile
index 3428802..9491835 100644
--- a/Makefile
+++ b/Makefile
@@ -21,7 +21,7 @@ CXXFLAGS = -std=gnu++11 $(OPTFLAGS) $(DEBUGFLAGS) $(shell getconf LFS_CFLAGS) $(
 LDFLAGS = -L. $(shell getconf LFS_LDFLAGS)
 LIBTCMALLOC = -ltcmalloc_minimal
 LDLIBS = $(shell getconf LFS_LIBS) -lyrmcds $(LIBTCMALLOC) -latomic -lpthread
-CLDOC = LD_LIBRARY_PATH=/usr/local/clang/lib cldoc
+CLDOC := LD_LIBRARY_PATH=$(shell llvm-config --libdir) cldoc
 
 HEADERS = $(wildcard src/*.hpp cybozu/*.hpp)
 SOURCES = $(wildcard src/*.cpp cybozu/*.cpp)