cgraph: control Flex unistd.h suppression by whether we are on Windows

Windows is the only non-unistd.h-having platform we support.

Gitlab: #2204

diff --git a/lib/cgraph/CMakeLists.txt b/lib/cgraph/CMakeLists.txt
index 0287f9259e2fadedc56bc0975bc319bcfafb1be3..53af6b2cadcd4e35e967b82f62a7b66b30690b3f 100644 (file)
--- a/lib/cgraph/CMakeLists.txt
+++ b/lib/cgraph/CMakeLists.txt
@@ -5,7 +5,7 @@ FLEX_TARGET(Scan ${CMAKE_CURRENT_SOURCE_DIR}/scan.l
 ADD_FLEX_BISON_DEPENDENCY(Scan Grammar)
 
 add_definitions(-DEXPORT_CGRAPH -DEXPORT_AGXBUF -DEXPORT_CGHDR)
-if(NOT HAVE_UNISTD_H)
+if(WIN32 AND NOT MINGW)
   add_definitions(-DYY_NO_UNISTD_H)
 endif()