diff --git a/CMakeLists.txt b/CMakeLists.txt
index 51185601b7..acaad7c08c 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -283,15 +283,17 @@ if(UNIX OR MINGW)
 	    set(LYX_USE_STD_REGEX 0)
 	  endif()
 	else()
-	  execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION OUTPUT_STRIP_TRAILING_WHITESPACE)
+	  execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpfullversion OUTPUT_VARIABLE GCC_VERSION ERROR_VARIABLE _error RESULT_VARIABLE _err OUTPUT_STRIP_TRAILING_WHITESPACE)
+	  #message(STATUS "dumpfullversion: error = ${_error}, result = ${_err}")
+	  if (_err)
+	    # previous check failed, try again with _old_ parameter
+	    execute_process(COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION ERROR_VARIABLE _error RESULT_VARIABLE _err OUTPUT_STRIP_TRAILING_WHITESPACE)
+	    #message(STATUS "dumpversion: error = ${_error}, result = ${_err}")
+	  endif()
 	  message(STATUS "Using GCC version ${GCC_VERSION}")
 	  if(GCC_VERSION VERSION_LESS 4.9)
-		  if(GCC_VERSION VERSION_LESS 4.6)
-			  message(FATAL_ERROR "gcc >= 4.6 is required.")
-		  endif()
-		  # <regex> in gcc is unusable in versions less than 4.9.0
-		  # see https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53631
-		  set(LYX_USE_STD_REGEX 0)
+		  # Drop support for gcc versions prior to 4.9
+		  message(FATAL_ERROR "gcc >= 4.9 is required.")
 	  else()
 		  set(LYX_USE_STD_REGEX 1)
 	  endif()
@@ -299,6 +301,8 @@ if(UNIX OR MINGW)
 	set(LYX_GCC11_MODE "${CXX11_FLAG}")
 else()
 	if(MSVC_VERSION LESS 1915)
+		# Drop support for msvc versions prior to 1915
+		message(FATAL_ERROR "msvc >= 1915 is required.")
 		set(LYX_USE_STD_REGEX 0)
 	else()
 		set(LYX_USE_STD_REGEX 1)