Index: configure.ac
==================================================================
--- configure.ac
+++ configure.ac
@@ -67,10 +67,11 @@
 AC_TRY_COMPILE([], [
 	int (^foo)(int bar);
 	foo = ^(int bar) { return 0; }
 	], [
 	AC_DEFINE(OF_HAVE_BLOCKS, 1, [Compiler support for blocks])
+	AC_SUBST(BLOCKS_FLAGS, "-fblocks")
 	AC_MSG_RESULT(yes)
 	], [
 	AC_MSG_RESULT(no)
 	OBJCFLAGS="$old_OBJCFLAGS"
 	])

Index: utils/objfw-config.in
==================================================================
--- utils/objfw-config.in
+++ utils/objfw-config.in
@@ -6,11 +6,11 @@
 CPPFLAGS="-I@includedir@"
 CXXFLAGS=""
 OBJC="@OBJC@"
 OBJCFLAGS="@GNU_RUNTIME@ -fexceptions -fobjc-exceptions"
 OBJCFLAGS="$OBJCFLAGS -fconstant-string-class=OFConstString"
-OBJCFLAGS="$OBJCFLAGS @NO_CONST_CFSTRINGS@ @NO_WARN_UNUSED@"
+OBJCFLAGS="$OBJCFLAGS @NO_CONST_CFSTRINGS@ @BLOCKS_FLAGS@ @NO_WARN_UNUSED@"
 LDFLAGS=""
 LDFLAGS_REEXPORT="@LDFLAGS_REEXPORT@"
 LDFLAGS_RPATH="@LDFLAGS_RPATH@"
 LIBS="-L${libdir} -lobjfw @LIBS@"
 VERSION="0.4-dev"