Use GNUInstallDirs to allow changing target directories

* Multi-lib distributions need to change the libdir
  which is only portably possible with `GNUInstallDirs`.
* Multi-arch distributions such as Debian and Exherbo
  need to be able to change the bindir.

CMakeLists.txt

@@ -2,7 +2,7 @@
 ## Author: Hank Anderson <hank@statease.com>
 ##
 
-cmake_minimum_required(VERSION 2.8.4)
+cmake_minimum_required(VERSION 2.8.5)
 project(OpenBLAS)
 set(OpenBLAS_MAJOR_VERSION 0)
 set(OpenBLAS_MINOR_VERSION 2)
@@ -12,6 +12,9 @@ set(OpenBLAS_VERSION "${OpenBLAS_MAJOR_VERSION}.${OpenBLAS_MINOR_VERSION}.${Open
 enable_language(ASM)
 enable_language(C)
 
+# Adhere to GNU filesystem layout conventions
+include(GNUInstallDirs)
+
 if(MSVC)
 set(OpenBLAS_LIBNAME libopenblas)
 else()
@@ -216,23 +219,20 @@ set_target_properties(${OpenBLAS_LIBNAME} PROPERTIES
 
 # Install libraries
 install(TARGETS ${OpenBLAS_LIBNAME}
-	RUNTIME DESTINATION bin
-	ARCHIVE DESTINATION lib
-	LIBRARY DESTINATION lib )
+	RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
+	ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
+	LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR} )
 
 # Install include files
 FILE(GLOB_RECURSE INCLUDE_FILES "${CMAKE_CURRENT_SOURCE_DIR}/*.h")
-install (FILES ${INCLUDE_FILES} DESTINATION include)
+install (FILES ${INCLUDE_FILES} DESTINATION ${CMAKE_INSTALL_INCLUDEDIR})
  
 if(NOT MSVC)
-	install (TARGETS ${OpenBLAS_LIBNAME}_static DESTINATION lib)
+	install (TARGETS ${OpenBLAS_LIBNAME}_static DESTINATION ${CMAKE_INSTALL_LIBDIR})
 endif()
 
 include(FindPkgConfig QUIET)
 if(PKG_CONFIG_FOUND)
-	set(prefix ${CMAKE_INSTALL_PREFIX})
-	set(libdir ${CMAKE_INSTALL_PREFIX}/lib)
-	set(includedir ${CMAKE_INSTALL_PREFIX}/include)
 	configure_file(${PROJECT_SOURCE_DIR}/cmake/openblas.pc.in ${PROJECT_BINARY_DIR}/openblas.pc @ONLY)
-	install (FILES ${PROJECT_BINARY_DIR}/openblas.pc DESTINATION lib/pkgconfig/)
+	install (FILES ${PROJECT_BINARY_DIR}/openblas.pc DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig/)
 endif()

cmake/openblas.pc.in

@@ -1,6 +1,5 @@
-prefix=@prefix@
-libdir=@libdir@
-includedir=@includedir@
+libdir=@CMAKE_INSTALL_FULL_LIBDIR@
+includedir=@CMAKE_INSTALL_FULL_INCLUDEDIR@
 
 Name: OpenBLAS
 Description: OpenBLAS is an optimized BLAS library based on GotoBLAS2 1.13 BSD version