## the following are directories where stuff will be installed to
set(LIB_SUFFIX "" CACHE STRING "Define suffix of directory name (32/64)")
-set(EXEC_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}" CACHE PATH "Base directory for executables and libraries" FORCE)
-set(BIN_INSTALL_DIR "${EXEC_INSTALL_PREFIX}/bin" CACHE PATH "The subdirectory to the binaries prefix (default prefix/bin)" FORCE)
-set(LIB_INSTALL_DIR "${EXEC_INSTALL_PREFIX}/lib${LIB_SUFFIX}" CACHE PATH "The subdirectory relative to the install prefix where libraries will be installed (default is /lib${LIB_SUFFIX})" FORCE)
-set(INCLUDE_INSTALL_DIR "${CMAKE_INSTALL_PREFIX}/include" CACHE PATH "The subdirectory to the header prefix" FORCE)
+set(EXEC_INSTALL_PREFIX "${CMAKE_INSTALL_PREFIX}" CACHE PATH "Base directory for executables and libraries")
+set(BIN_INSTALL_DIR "${EXEC_INSTALL_PREFIX}/bin" CACHE PATH "The subdirectory to the binaries prefix (default prefix/bin)")
+set(LIB_INSTALL_DIR "${EXEC_INSTALL_PREFIX}/lib${LIB_SUFFIX}" CACHE PATH "The subdirectory relative to the install prefix where libraries will be installed (default is /lib${LIB_SUFFIX})")
+set(INCLUDE_INSTALL_DIR "${CMAKE_INSTALL_PREFIX}/include" CACHE PATH "The subdirectory to the header prefix")
if(APPLE)
option(BUILD_FRAMEWORK "Build an OS X framework" OFF)