libselinux: build with either ruby 1.9 or ruby 1.8

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Dan Walsh <dwalsh@redhat.com>
diff --git a/libselinux/src/Makefile b/libselinux/src/Makefile
index 5ddc011..472ec61 100644
--- a/libselinux/src/Makefile
+++ b/libselinux/src/Makefile
@@ -15,7 +15,7 @@
 PYLIBDIR ?= $(LIBDIR)/$(PYLIBVER)
 RUBYLIBVER ?= $(shell ruby -e 'print RUBY_VERSION.split(".")[0..1].join(".")')
 RUBYPLATFORM ?= $(shell ruby -e 'print RUBY_PLATFORM')
-RUBYINC ?= $(shell pkg-config --cflags ruby-$(RUBYLIBVER))
+RUBYINC ?= -I$(LIBDIR)/ruby/$(RUBYLIBVER)/$(RUBYPLATFORM)
 RUBYINSTALL ?= $(LIBDIR)/ruby/site_ruby/$(RUBYLIBVER)/$(RUBYPLATFORM)
 LIBBASE=$(shell basename $(LIBDIR))