Added option to disable the installer

CMakeLists.txt

@@ -216,6 +216,9 @@ if(PHYSFS_BUILD_TEST)
     set(PHYSFS_INSTALL_TARGETS ${PHYSFS_INSTALL_TARGETS} ";test_physfs")
 endif()
 
+option(PHYSFS_DISABLE_INSTALL "Disable installing PhysFS" OFF)
+if(NOT PHYSFS_DISABLE_INSTALL)
+
 install(TARGETS ${PHYSFS_INSTALL_TARGETS} EXPORT PhysFSExport
         RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
         LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
@@ -290,6 +293,8 @@ if(NOT MSVC)
     )
 endif()
 
+endif(NOT PHYSFS_DISABLE_INSTALL)
+
 macro(message_bool_option _NAME _VALUE)
     if(${_VALUE})
         message(STATUS "  ${_NAME}: enabled")