https://bugs.gentoo.org/828879
--- a/configure.ac
+++ b/configure.ac
@@ -16,20 +16,12 @@ AM_SANITY_CHECK
 AM_MAINTAINER_MODE
 AM_WITH_DMALLOC
 
-AC_PATH_GENERIC(imlib2, 1.0.0, [
-  AC_SUBST(IMLIB_LIBS)
-  AC_SUBST(IMLIB_CFLAGS) ],
-  AC_MSG_ERROR(Cannot find imlib2: Is imlib2-config in the path?) )
-
-dnl the above doesn't work for some reason :/
-IMLIB_LIBS=`imlib2-config --libs`
-IMLIB_CFLAGS=`imlib2-config --cflags`
-AC_SUBST(IMLIB_LIBS)
-AC_SUBST(IMLIB_CFLAGS)
-
-LIBS="$LIBS -lm"
-CFLAGS="$CFLAGS -Wall"
+PKG_PROG_PKG_CONFIG
+PKG_CHECK_MODULES([IMLIB], [imlib2 > 1.0])
+
+AC_CHECK_LIB([m],[cos])
 
+CFLAGS="$CFLAGS -Wall"
 
 AC_OUTPUT([
 Makefile