Update mesa.rb

modification for mesa build on armv7l

packages/mesa.rb

@@ -27,8 +27,12 @@ class Mesa < Package
   depends_on 'libxkbfile'
   depends_on 'wayland'
 
+  depends_on 'bison'
+
+  # tested on armv7l
   def self.build
-    system "./configure --enable-gles2 --with-egl-platforms=x11,wayland,drm --enable-gbm --enable-shared-glapi --with-gallium-drivers=swrast --disable-dri3"
+    system "pip install Mako"
+    system "./configure --prefix=#{CREW_PREFIX} --libdir=#{CREW_LIB_PREFIX} --enable-shared-glapi --with-gallium-drivers=nouveau --with-dri-drivers=nouveau --enable-egl --with-platforms=x11,drm,wayland --enable-gbm --enable-xa --enable-dri"
     system "make"
   end