Fix GMX_BUILD_OWN_FFTW for Cygwin

CMAKE_BINARY_PREFIX doesn't exist and thus the previous version added just
an extra slash which doesn't work under Cygwin.

Change-Id: I285f93020d0818515fff3f2cfbf41662f03190d0

diff --git a/src/contrib/fftw/CMakeLists.txt b/src/contrib/fftw/CMakeLists.txt
index 549b5766d43e6d2e3e9dceb59238e1b26a19bad5..b553c405899e650810ca23da118735b0d24a9bd4 100644 (file)
--- a/src/contrib/fftw/CMakeLists.txt
+++ b/src/contrib/fftw/CMakeLists.txt
@@ -91,8 +91,8 @@ externalproject_get_property(${EXTERNAL_FFTW_BUILD_TARGET} INSTALL_DIR)
 string(TOUPPER "${FFTW}" UPPERFFTW)
 string(TOLOWER "${FFTW}" LOWERFFTW)
 string(REGEX REPLACE "fftw" "fftw3" FFTW_LIBNAME ${LOWERFFTW})
-set(${UPPERFFTW}_LIBRARIES ${CMAKE_BINARY_PREFIX}/${INSTALL_DIR}/lib/lib${FFTW_LIBNAME}${CMAKE_STATIC_LIBRARY_SUFFIX})
-set(${UPPERFFTW}_INCLUDE_DIRS ${CMAKE_BINARY_PREFIX}/${INSTALL_DIR}/include PARENT_SCOPE)
+set(${UPPERFFTW}_LIBRARIES ${INSTALL_DIR}/lib/lib${FFTW_LIBNAME}${CMAKE_STATIC_LIBRARY_SUFFIX})
+set(${UPPERFFTW}_INCLUDE_DIRS ${INSTALL_DIR}/include PARENT_SCOPE)
 set(${UPPERFFTW}_FOUND TRUE PARENT_SCOPE)
 set(${UPPERFFTW}_HAVE_SIMD TRUE PARENT_SCOPE)