diff --git a/pkgs/freetype.yaml b/pkgs/freetype.yaml
index 0ede8bf30..8b2a73136 100644
--- a/pkgs/freetype.yaml
+++ b/pkgs/freetype.yaml
@@ -4,8 +4,8 @@ dependencies:
   run: [zlib, bzip2]
 
 sources:
-- url: http://download.savannah.gnu.org/releases/freetype/freetype-2.4.11.tar.gz
-  key: tar.gz:fgtq4vmghzfws73nt465yqc2rc4duml6
+- key: tar.bz2:qru7xajeozhykau4zashympbgkrmlziq
+  url: http://downloads.sourceforge.net/project/freetype/freetype2/2.6/freetype-2.6.tar.bz2
 
 build_stages:
 
diff --git a/pkgs/gcc/gcc.yaml b/pkgs/gcc/gcc.yaml
index d6e103935..b04da535b 100644
--- a/pkgs/gcc/gcc.yaml
+++ b/pkgs/gcc/gcc.yaml
@@ -6,10 +6,17 @@ dependencies:
 
 defaults:
   relocatable: false
+  version: 4.9.2
+
+when version == '4.9.2':
+    sources:
+    - key: tar.bz2:eaqmtauvqvvkcp62b4xtur4ujedvp7be
+      url: http://ftpmirror.gnu.org/gcc/gcc-4.9.2/gcc-4.9.2.tar.bz2
+when version == '5.1.0':
+    sources:
+    - key: tar.bz2:w7np36e4xmhcamz5x5nvgsjrtlqg4pi2
+      url: http://ftpmirror.gnu.org/gcc/gcc-5.1.0/gcc-5.1.0.tar.bz2
 
-sources:
-- key: tar.bz2:eaqmtauvqvvkcp62b4xtur4ujedvp7be
-  url: http://ftpmirror.gnu.org/gcc/gcc-4.9.2/gcc-4.9.2.tar.bz2
 
 build_stages:
   # Make gcc automatically embed RPATH to the proper libstdc++, libgfortran,
diff --git a/pkgs/pillow.yaml b/pkgs/pillow.yaml
index 430151538..e3c944ddc 100644
--- a/pkgs/pillow.yaml
+++ b/pkgs/pillow.yaml
@@ -1,10 +1,10 @@
-extends: [setuptools_package]
+extends: [setuptools_package, libflags]
 dependencies:
   build: [zlib, png, freetype, openjpeg]
 
 sources:
-- key: tar.gz:q5qmcgfaefplufr7o6bbcdt67tn3cx4k
-  url: https://pypi.python.org/packages/source/P/Pillow/Pillow-2.8.1.tar.gz
+- key: tar.gz:b4lz27tv47edwy2bxfmvziptstphbaki
+  url: https://pypi.python.org/packages/source/P/Pillow/Pillow-2.9.0.tar.gz
 
 build_stages:
 - name: build_ext_options
@@ -12,4 +12,5 @@ build_stages:
   before: install
   handler: bash
   bash: |
+       export MAX_CONCURRENCY=1
        export SETUPTOOLS_PACKAGE_EXTRA_OPTIONS="build_ext --enable-zlib --enable-freetype --enable-jpeg2000 --include-dirs=${ZLIB_DIR}/include:${PNG_DIR}/include:${FREETYPE_DIR}/include:${OPENJPEG_DIR}/include --library-dirs=${ZLIB_DIR}/lib:${PNG_DIR}/lib:${FREETYPE_DIR}/lib:${OPENJPEG_DIR}/lib"
diff --git a/pkgs/scikit-image.yaml b/pkgs/scikit-image.yaml
new file mode 100644
index 000000000..878982507
--- /dev/null
+++ b/pkgs/scikit-image.yaml
@@ -0,0 +1,8 @@
+extends: [setuptools_package]
+dependencies:
+  build: [numpy, scipy, cython, six]
+  run: [numpy, scipy, six, pillow]
+
+sources:
+- key: tar.gz:o2hfndzstglgykklp24m2ekpyzeppp5o
+  url: https://pypi.python.org/packages/source/s/scikit-image/scikit-image-0.11.3.tar.gz