ext/libgecode3/extconf.rb in dep-selector-libgecode-1.1.0 vs ext/libgecode3/extconf.rb in dep-selector-libgecode-1.2.0

@@ -43,18 +43,18 @@
     args
   end
 
   def self.setup_env
     if windows?
-      ENV['CC'] = 'gcc'
-      ENV['CXX'] = 'g++'
+      ENV['CC'] ||= 'gcc'
+      ENV['CXX'] ||= 'g++'
 
       # Ruby DevKit ships with BSD Tar
       ENV['PROG_TAR'] ||= 'bsdtar'
 
       # Optimize for size on Windows
-      ENV['CFLAGS'] = '-Os'
-      ENV['CXXFLAGS'] = '-Os'
+      ENV['CFLAGS'] = "#{ENV['CFLAGS']} -Os"
+      ENV['CXXFLAGS'] = "#{ENV['CXXFLAGS']} -Os"
     # Older versions of CentOS and RHEL need to use this
     elsif File.exist?('/usr/bin/gcc44')
       ENV['CC'] = 'gcc44'
       ENV['CXX'] = 'g++44'
     end