diff -urN mysql-5.7.20.orig/CMakeLists.txt mysql-5.7.20/CMakeLists.txt
--- mysql-5.7.20.orig/CMakeLists.txt	2017-11-09 15:40:55.000000000 +0000
+++ mysql-5.7.20/CMakeLists.txt	2017-11-09 15:42:52.000000000 +0000
@@ -183,9 +183,12 @@
 # Following autotools tradition, add preprocessor definitions
 # specified in environment variable CPPFLAGS
 IF(DEFINED ENV{CPPFLAGS})
-  ADD_DEFINITIONS($ENV{CPPFLAGS})
+  SET(ENV_CPPFLAGS $ENV{CPPFLAGS})
+  SEPARATE_ARGUMENTS(ENV_CPPFLAGS)
+  ADD_DEFINITIONS(${ENV_CPPFLAGS})
 ENDIF()
 
+
 INCLUDE(CheckTypeSize)
 CHECK_TYPE_SIZE("void *" SIZEOF_VOIDP)
 MESSAGE(STATUS "SIZEOF_VOIDP ${SIZEOF_VOIDP}")