Improved build system to check compile time dependencies

cmake/modules/FindPStreams.cmake

@@ -0,0 +1,17 @@
+# If already in cache, be silent
+if(PSTREAMS_INCLUDE_DIRS)
+  set (PSTREAMS_FIND_QUIETLY TRUE)
+endif()
+
+FIND_PATH(PSTREAMS_INCLUDE_DIR NAMES pstream.h
+          PATH_SUFFIXES pstreams
+          HINTS ${PSTREAMS_ROOT}/include $ENV{PSTREAMS_ROOT})
+
+set(PSTREAMS_INCLUDE_DIRS ${PSTREAMS_INCLUDE_DIR})
+
+# Handle the QUIETLY and REQUIRED arguments and set PSTREAMS_FOUND to TRUE if
+# all listed variables are TRUE.
+INCLUDE(FindPackageHandleStandardArgs)
+FIND_PACKAGE_HANDLE_STANDARD_ARGS(Pstreams DEFAULT_MSG PSTREAMS_INCLUDE_DIRS)
+
+MARK_AS_ADVANCED(PSTREAMS_INCLUDE_DIRS)