Example package spec for cmake (#65)

Signed-off-by: Larry Gritz <lg@larrygritz.com>

packages/cmake/cmake.spk.yaml

@@ -0,0 +1,28 @@
+pkg: cmake/3.16.4
+
+sources:
+  # Idiom that retrieves the tar file from github if it isn't already local.
+  # Sites without direct internet access may instead want to pre-download
+  # the tar file.
+  - path: ./
+  - script:
+    - export TARFILE=cmake-3.16.4-Linux-x86_64.tar.gz
+    - if [ ! -e ./$TARFILE ] ; then wget https://github.com/Kitware/CMake/releases/download/v3.16.4/$TARFILE ; fi
+
+build:
+  options:
+  - var: arch
+  - var: os
+  script:
+    - mkdir -p build; cd build
+    - tar -xvf
+        ../cmake-3.16.4-Linux-x86_64.tar.gz
+        --strip-components=1
+        --exclude=doc
+        --exclude=Help
+    - rsync -rv ./ $PREFIX/
+    - mkdir -p /spfs/etc/spfs/startup.d
+    - echo "export CMAKE_SYSTEM_INCLUDE_PATH=/spfs/include" > /spfs/etc/spfs/startup.d/activate_cmake.sh
+    - echo "export CMAKE_SYSTEM_PREFIX_PATH=/spfs" >> /spfs/etc/spfs/startup.d/activate_cmake.sh
+    - echo "setenv CMAKE_SYSTEM_INCLUDE_PATH /spfs/include" > /spfs/etc/spfs/startup.d/activate_cmake.csh
+    - echo "setenv CMAKE_SYSTEM_PREFIX_PATH /spfs" >> /spfs/etc/spfs/startup.d/activate_cmake.csh