Fix Windows build break.
Change-Id: I8b2b4c795429fd10ceeff83016825f1a9a8e305d
diff --git a/CMakeLists.txt b/CMakeLists.txt
index dc31231..49a1399 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -398,14 +398,14 @@
# Use threads but not on Android, where there is no support for OpenMP yet.
-IF (${UNIX} AND NOT ${BUILD_ANDROID})
+IF ("${UNIX}" AND NOT ${BUILD_ANDROID})
# At least on Linux, we need pthreads to be enabled for mutex to compile.
# This may not work on windows or android.
FIND_PACKAGE(Threads REQUIRED)
SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} ${CMAKE_THREAD_LIBS_INIT}")
ADD_DEFINITIONS(-DCERES_HAVE_PTHREAD)
ADD_DEFINITIONS(-DCERES_HAVE_RWLOCK)
-ENDIF (${UNIX} AND NOT ${BUILD_ANDROID})
+ENDIF ("${UNIX}" AND NOT ${BUILD_ANDROID})
# Disable threads in mutex.h. Someday, after there is OpenMP support in
# Android, this can get removed.
