--- gflags-2.2.2/CMakeLists.txt.orig	2018-11-12 00:21:00.000000000 +0300
+++ gflags-2.2.2/CMakeLists.txt	2018-11-19 13:23:58.872932000 +0300
@@ -413,7 +413,7 @@
 
 # ----------------------------------------------------------------------------
 # installation directories
-if (OS_WINDOWS)
+if (OS_WINDOWS AND NOT MINGW)
   set (RUNTIME_INSTALL_DIR "bin")
   set (LIBRARY_INSTALL_DIR "lib")
   set (INCLUDE_INSTALL_DIR "include")