Index: src/Makefile
===================================================================
--- src/Makefile.orig	2013-01-30 13:24:55.549631752 +0100
+++ src/Makefile	2013-01-30 13:25:56.148209843 +0100
@@ -16,8 +16,8 @@
 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)
-RUBYINSTALL ?= $(LIBDIR)/ruby/site_ruby/$(RUBYLIBVER)/$(RUBYPLATFORM)
+RUBYINC ?= $(shell ruby -r rbconfig -e "print Config::CONFIG['rubyhdrdir'].nil? ? '$(LIBDIR)/ruby/$(RUBYLIBVER)' : Config::CONFIG['rubyhdrdir']")
+RUBYINSTALL ?= $(shell ruby -r rbconfig -e "print Config::CONFIG['vendorarchdir'].nil? ? '$(DESTDIR)'+Config::CONFIG['sitearchdir'] : '$(DESTDIR)'+Config::CONFIG['vendorarchdir']")
 LIBBASE ?= $(shell basename $(LIBDIR))
 
 VERSION = $(shell cat ../VERSION)
@@ -103,7 +103,7 @@ $(SWIGLOBJ): $(SWIGCOUT)
 	$(CC) $(CFLAGS) $(SWIG_CFLAGS) $(PYINC) -fPIC -DSHARED -c -o $@ $<
 
 $(SWIGRUBYLOBJ): $(SWIGRUBYCOUT)
-	$(CC) $(CFLAGS) $(SWIG_CFLAGS) $(RUBYINC) -fPIC -DSHARED -c -o $@ $<
+	$(CC) $(filter-out -Werror, $(CFLAGS)) -I$(RUBYINC) -I$(RUBYINC)/$(RUBYPLATFORM) -fPIC -DSHARED -c -o $@ $<
 
 $(SWIGSO): $(SWIGLOBJ)
 	$(CC) $(CFLAGS) -shared -o $@ $< -L. -lselinux $(LDFLAGS) -L$(LIBDIR)