diff --git a/libselinux/src/Makefile b/libselinux/src/Makefile
index f9a1e5f544..ffcd362799 100644
--- a/libselinux/src/Makefile
+++ b/libselinux/src/Makefile
@@ -149,7 +149,7 @@ pywrap: all selinuxswig_python_exception.i
 rubywrap: all $(SWIGRUBYSO)
 
 $(SWIGRUBYLOBJ): $(SWIGRUBYCOUT)
-	$(CC) $(CFLAGS) $(SWIG_CFLAGS) $(RUBYINC) -fPIC -DSHARED -c -o $@ $<
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(SWIG_CFLAGS) $(RUBYINC) -fPIC -DSHARED -c -o $@ $<
 
 $(SWIGRUBYSO): $(SWIGRUBYLOBJ)
 	$(CC) $(CFLAGS) $(LDFLAGS) -L. -shared -o $@ $^ -lselinux $(RUBYLIBS)
@@ -169,10 +169,10 @@ selinuxswig_python_exception.i: exception.sh ../include/selinux/selinux.h
 	bash -e exception.sh > $@ || (rm -f $@ ; false)
 
 %.o:  %.c policy.h
-	$(CC) $(CFLAGS) $(TLSFLAGS) -c -o $@ $<
+	$(CC) $(CPPFLAGS) $(CFLAGS) $(TLSFLAGS) -c -o $@ $<
 
 %.lo:  %.c policy.h
-	$(CC) $(CFLAGS) -fPIC -DSHARED -c -o $@ $<
+	$(CC) $(CPPFLAGS) $(CFLAGS) -fPIC -DSHARED -c -o $@ $<
 
 $(SWIGRUBYCOUT): $(SWIGRUBYIF)
 	$(SWIGRUBY) $<