diff.patch

diff --git a/Makefile b/Makefile
index b23bf18..3fc2adc 100644
--- a/Makefile
+++ b/Makefile
@@ -21,6 +21,10 @@ KRKMODS  = $(wildcard modules/*.krk modules/*/*.krk modules/*/*/*.krk)

 all: ${TARGET} ${MODULES} ${TOOLS} ${GENMODS}

+ifneq ($(shell tools/can-floor-without-libm.sh $(CC)),yes)
+  LDLIBS += -lm
+endif
+
 ifeq (,$(findstring mingw,$(CC)))
   CFLAGS  += -pthread
   LDLIBS  += -ldl -lpthread
diff --git a/tools/can-floor-without-libm.sh b/tools/can-floor-without-libm.sh
new file mode 100755
index 0000000..fc989da
--- /dev/null
+++ b/tools/can-floor-without-libm.sh
@@ -0,0 +1,8 @@
+#!/bin/sh
+($1 -o /dev/null -x c - 2>/dev/null && echo "yes" || echo "no") <<END
+#include <stdio.h>
+#include <stdlib.h>
+int main(int argc, char * argv[]) {
+	return printf("%f", __builtin_floor(strtod(argv[1],NULL)));
+}
+END