Index: uspace/lib/c/Makefile
===================================================================
--- uspace/lib/c/Makefile	(revision 119b46e45d903caf31b28eb1f2046fe108aa20c4)
+++ uspace/lib/c/Makefile	(revision 8a26f8212ef1c0651cc9076477be1315e84107b2)
@@ -161,14 +161,14 @@
 
 $(LIBC_PREFIX)/arch/$(UARCH)/_link.ld: $(LIBC_PREFIX)/arch/$(UARCH)/_link.ld.in
-	$(GCC) $(DEFS) $(CFLAGS) -DLIBC_PATH=$(CURDIR) -E -x c $< | grep -v "^\#" > $@
+	$(CC) $(DEFS) $(CFLAGS) -DLIBC_PATH=$(CURDIR) -E -x c $< | grep -v "^\#" > $@
 
 $(LIBC_PREFIX)/arch/$(UARCH)/_link-loader.ld: $(LIBC_PREFIX)/arch/$(UARCH)/_link.ld.in
-	$(GCC) $(DEFS) $(CFLAGS) -DLIBC_PATH=$(CURDIR) -DLOADER -E -x c $< | grep -v "^\#" > $@
+	$(CC) $(DEFS) $(CFLAGS) -DLIBC_PATH=$(CURDIR) -DLOADER -E -x c $< | grep -v "^\#" > $@
 
 $(LIBC_PREFIX)/arch/$(UARCH)/_link-shlib.ld: $(LIBC_PREFIX)/arch/$(UARCH)/_link.ld.in
-	$(GCC) $(DEFS) $(CFLAGS) -DLIBC_PATH=$(CURDIR) -DSHLIB -E -x c $< | grep -v "^\#" > $@
+	$(CC) $(DEFS) $(CFLAGS) -DLIBC_PATH=$(CURDIR) -DSHLIB -E -x c $< | grep -v "^\#" > $@
 
 $(LIBC_PREFIX)/arch/$(UARCH)/_link-dlexe.ld: $(LIBC_PREFIX)/arch/$(UARCH)/_link.ld.in
-	$(GCC) $(DEFS) $(CFLAGS) -DLIBC_PATH=$(CURDIR) -DDLEXE -E -x c $< | grep -v "^\#" > $@
+	$(CC) $(DEFS) $(CFLAGS) -DLIBC_PATH=$(CURDIR) -DDLEXE -E -x c $< | grep -v "^\#" > $@
 
 $(COMMON_HEADER_ARCH): $(COMMON_HEADER)
Index: uspace/lib/c/arch/amd64/Makefile.common
===================================================================
--- uspace/lib/c/arch/amd64/Makefile.common	(revision 119b46e45d903caf31b28eb1f2046fe108aa20c4)
+++ uspace/lib/c/arch/amd64/Makefile.common	(revision 8a26f8212ef1c0651cc9076477be1315e84107b2)
@@ -28,5 +28,7 @@
 
 CLANG_ARCH = x86_64
+CLANG_TARGET = x86_64-unknown-linux
 GCC_CFLAGS += -fno-omit-frame-pointer
+CLANG_CFLAGS += -fno-omit-frame-pointer
 
 ENDIANESS = LE
Index: uspace/lib/c/arch/ia32/Makefile.common
===================================================================
--- uspace/lib/c/arch/ia32/Makefile.common	(revision 119b46e45d903caf31b28eb1f2046fe108aa20c4)
+++ uspace/lib/c/arch/ia32/Makefile.common	(revision 8a26f8212ef1c0651cc9076477be1315e84107b2)
@@ -28,4 +28,5 @@
 
 CLANG_ARCH = i386
+CLANG_TARGET = i386-unknown-linux
 
 ifeq ($(PROCESSOR),i486)
@@ -34,4 +35,5 @@
 	GCC_CFLAGS += -march=pentium -fno-omit-frame-pointer
 endif
+CLANG_CFLAGS += -fno-omit-frame-pointer
 
 ENDIANESS = LE
Index: uspace/lib/c/include/io/verify.h
===================================================================
--- uspace/lib/c/include/io/verify.h	(revision 119b46e45d903caf31b28eb1f2046fe108aa20c4)
+++ uspace/lib/c/include/io/verify.h	(revision 8a26f8212ef1c0651cc9076477be1315e84107b2)
@@ -38,6 +38,11 @@
 #ifndef NVERIFY_PRINTF
 
+#ifdef __clang__
+#define PRINTF_ATTRIBUTE(start, end) \
+	__attribute__((format(__printf__, start, end)))
+#else
 #define PRINTF_ATTRIBUTE(start, end) \
 	__attribute__((format(gnu_printf, start, end)))
+#endif
 
 #else /* NVERIFY_PRINTF */