--- ogre-pagedgeometry/CMakeLists.txt.orig	2018-07-23 09:23:55.472168200 +0300
+++ ogre-pagedgeometry/CMakeLists.txt	2018-07-23 09:24:13.240599400 +0300
@@ -49,7 +49,7 @@
 
 
 # some optimization flags
-if(WIN32)
+if(MSVC)
   # add multi processor compilation flags
   set(CMAKE_CXX_FLAGS_RELEASE        "${CMAKE_CXX_FLAGS_RELEASE}        /MP /GL /Ox /Ob2 /Oi /Ot /Oy /fp:fast /GS- /MP /Zi")
   set(CMAKE_CXX_FLAGS_MINSIZEREL     "${CMAKE_CXX_FLAGS_MINSIZEREL}     /MP /Zi")
@@ -63,10 +63,10 @@
   set(CMAKE_EXE_LINKER_FLAGS_RELEASE        "${CMAKE_EXE_LINKER_FLAGS_RELEASE}        /DEBUG /SUBSYSTEM:WINDOWS /LTCG /OPT:REF")
   set(CMAKE_EXE_LINKER_FLAGS_MINSIZEREL     "${CMAKE_EXE_LINKER_FLAGS_MINSIZEREL}     /DEBUG /SUBSYSTEM:WINDOWS /LTCG /OPT:REF")
   set(CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO "${CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO} /DEBUG /SUBSYSTEM:WINDOWS /LTCG /OPT:REF")
-ELSEIF(UNIX)
+ELSEIF()
   set(CMAKE_EXE_LINKER_FLAGS_RELEASE      "${CMAKE_EXE_LINKER_FLAGS_RELEASE}      -mfpmath=sse -msse2 -mmmx -msse -msse3 -m3dnow -O2 -fomit-frame-pointer -fstrict-aliasing -ffast-math -ftracer")
   set(CMAKE_EXE_LINKER_FLAGS_RelWithDebug "${CMAKE_EXE_LINKER_FLAGS_RelWithDebug} -O0")
-endif(WIN32)
+endif()
 
 # some PG build options
 set(PAGEDGEOMETRY_BUILD_SAMPLES         "FALSE" CACHE BOOL "build the examples")