diff --git a/3rdparty/ext_openexr/CMakeLists.txt b/3rdparty/ext_openexr/CMakeLists.txt
--- a/3rdparty/ext_openexr/CMakeLists.txt
+++ b/3rdparty/ext_openexr/CMakeLists.txt
@@ -1,17 +1,33 @@
-SET(PREFIX_ext_openexr "${EXTPREFIX}" )
+SET(EXTPREFIX_openexr "${EXTPREFIX}" )
+if (MSVC OR MINGW)
 ExternalProject_Add( ext_openexr
         DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
         URL http://files.kde.org/krita/build/dependencies/openexr-2.2.0.tar.gz
         URL_MD5 b64e931c82aa3790329c21418373db4e
-        
+
         PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/openexr.diff
         COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/patch_mingw.patch
 
-        INSTALL_DIR ${PREFIX_ext_openexr}
-        CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${PREFIX_ext_openexr} -DILMBASE_PACKAGE_PREFIX=${PREFIX_ext_openexr} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE} -DNAMESPACE_VERSIONING=OFF
-            
+        INSTALL_DIR ${EXTPREFIX_openexr}
+        CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${EXTPREFIX_openexr} -DILMBASE_PACKAGE_PREFIX=${EXTPREFIX_openexr} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE} -DNAMESPACE_VERSIONING=OFF
+
         UPDATE_COMMAND ""
         ALWAYS 0
         DEPENDS ext_ilmbase ext_zlib
 )
+else()
+ExternalProject_Add(ext_openexr
+        DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
+        URL http://files.kde.org/krita/build/dependencies/openexr-2.2.0.tar.gz
+        URL_MD5 b64e931c82aa3790329c21418373db4e
+
+        PATCH_COMMAND ${PATCH_COMMAND} -p1 -i ${CMAKE_CURRENT_SOURCE_DIR}/openexr.diff
+
+        INSTALL_DIR ${EXTPREFIX_openexr}
+        CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${EXTPREFIX_openexr} -DILMBASE_PACKAGE_PREFIX=${EXTPREFIX_openexr} -DCMAKE_BUILD_TYPE=${GLOBAL_BUILD_TYPE} ${GLOBAL_PROFILE} -DNAMESPACE_VERSIONING=OFF
 
+        UPDATE_COMMAND ""
+        ALWAYS 0
+        DEPENDS ext_ilmbase ext_zlib
+)
+endif()