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user1 ~/download/try/crystal_library (master) $ make CRYSTAL_ROOT=/opt/crystal
CRYSTAL_PATH="src:/opt/crystal/share/crystal/src" /opt/crystal/bin/crystal build \
	--release --cross-compile -o libcounter src/libcounter.cr
cc 'libcounter.o' -o 'libcounter'  -rdynamic  -lpcre -lgc -lpthread /opt/crystal/share/crystal/src/ext/libcrystal.a -levent -lrt -ldl -L/usr/lib -L/usr/local/lib
ar rcs libcounter.a libcounter.o
user1 ~/download/try/crystal_library (master) $ make test
cc test/counter_test.c ./libcounter.a /opt/crystal/share/crystal/src/ext/libcrystal.a -lgc -ldl -levent -lpcre -o counter_test
./libcounter.a(libcounter.o): In function `main':
/opt/crystal/share/crystal/src/crystal/main.cr:134: multiple definition of `main'
/tmp/ccowU1tv.o:counter_test.c:(.text+0x0): first defined here
/usr/bin/ld: cannot find -lgc
collect2: error: ld returned 1 exit status
Makefile:18: recipe for target 'counter_test' failed
make: *** [counter_test] Error 1