Created a couple of cmake cache variables for conditional building of cuda and brook libraries

Modified FindBrook.cmake to be a bit more specific about finding BROOK_INCLUDE_DIR, so it finds on my computer

CMakeLists.txt

@@ -48,7 +48,7 @@ ENDIF(${CMAKE_INSTALL_PREFIX_INITIALIZED_TO_DEFAULT})
 
 INCLUDE(Dart)
 
-SUBDIRS (platforms/reference/tests platforms/cuda)
+# SUBDIRS (platforms/reference/tests platforms/cuda)
 
 ADD_DEFINITIONS(-DOPENMM_BUILDING_SHARED_LIBRARY)
 
@@ -56,7 +56,6 @@ ADD_DEFINITIONS(-DOPENMM_BUILDING_SHARED_LIBRARY)
 # this CMakeLists file rather than letting CMake visit them as SUBDIRS.
 SET(OPENMM_SOURCE_SUBDIRS . openmmapi olla platforms/reference)
 
-
 # The build system will set ARCH64 for 64 bit builds, which require
 # use of the lib64/ library directories rather than lib/.
 #SET( ARCH64 OFF CACHE BOOL "ON for 64bit builds, OFF for 32bit builds")
@@ -249,6 +248,21 @@ IF(DL_LIBRARY)
   TARGET_LINK_LIBRARIES(${STATIC_TARGET} ${DL_LIBRARY})
 ENDIF(DL_LIBRARY)
 
+ADD_SUBDIRECTORY(platforms/reference/tests)
+
+# Which hardware platforms to build
+
+SET(OPENMM_BUILD_CUDA_LIB ON CACHE BOOL "Build OpenMMCuda library for Nvidia GPUs")
+IF(OPENMM_BUILD_CUDA_LIB)
+    ADD_SUBDIRECTORY(platforms/cuda)
+ENDIF(OPENMM_BUILD_CUDA_LIB)
+
+SET(OPENMM_BUILD_BROOK_LIB ON CACHE BOOL "Build OpenMMBrook library for ATI GPUs")
+IF(OPENMM_BUILD_BROOK_LIB)
+    ADD_SUBDIRECTORY(platforms/brook)
+ENDIF(OPENMM_BUILD_BROOK_LIB)
+
+
 INSTALL_TARGETS(/lib RUNTIME_DIRECTORY /lib ${SHARED_TARGET})
 INSTALL_TARGETS(/lib RUNTIME_DIRECTORY /lib ${STATIC_TARGET})
 FILE(GLOB CORE_HEADERS     include/*.h          */include/*.h)

platforms/brook/brook-cmake/FindBrook.cmake

@@ -12,7 +12,7 @@
 
 # ----------------------------------------------------------------------------
 
-FIND_PATH(BROOK_INCLUDE_DIR brook $ENV{BROOKROOT}/sdk/include) 
+FIND_PATH(BROOK_INCLUDE_DIR brook/brook.hpp $ENV{BROOKROOT}/sdk/include) 
 
 SET(BROOK_CXXFLAGS "-I${BROOK_INCLUDE_DIR}") 
 SET(BROOK_CFLAGS "${BROOK_CXXFLAGS}")