diff --git a/3rdparty/ext_heif/CMakeLists.txt b/3rdparty/ext_heif/CMakeLists.txt
index a394aee9be..1b710db6bd 100644
--- a/3rdparty/ext_heif/CMakeLists.txt
+++ b/3rdparty/ext_heif/CMakeLists.txt
@@ -1,71 +1,74 @@
 SET(EXTPREFIX_heif "${EXTPREFIX}" )
 ExternalProject_Add(
     ext_libde265
     DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
     URL https://github.com/strukturag/libde265/releases/download/v1.0.3/libde265-1.0.3.tar.gz
     URL_MD5 0e1e26ffcb2177c3749c748e20fcd588
 
     BUILD_IN_SOURCE 1
 
     CONFIGURE_COMMAND <SOURCE_DIR>/configure --prefix=${EXTPREFIX_heif} ${GLOBAL_AUTOMAKE_PROFILE}
     BUILD_COMMAND make
     INSTALL_COMMAND make install
 
     UPDATE_COMMAND ""
 )
 
 ExternalProject_Add(
     ext_yasm
     DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
     URL http://www.tortall.net/projects/yasm/releases/yasm-1.3.0.tar.gz
     URL_MD5 fc9e586751ff789b34b1f21d572d96af
 
     CONFIGURE_COMMAND <SOURCE_DIR>/configure --prefix=${EXTPREFIX_heif} ${GLOBAL_AUTOMAKE_PROFILE}
     BUILD_COMMAND make
     INSTALL_COMMAND make install
 
     UPDATE_COMMAND ""
 )
 
 ExternalProject_Add(
     ext_nasm
     DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
     URL https://www.nasm.us/pub/nasm/releasebuilds/2.14.03rc2/nasm-2.14.03rc2.tar.gz
     URL_MD5 4cd1fe6788cd15d08c1a8f18b6d2428e
 
     CONFIGURE_COMMAND <SOURCE_DIR>/configure --prefix=${EXTPREFIX_heif} ${GLOBAL_AUTOMAKE_PROFILE}
     BUILD_COMMAND make
     INSTALL_COMMAND make install
 
     UPDATE_COMMAND ""
 )
 
 ExternalProject_Add(
     ext_libx265
     DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
     URL http://ftp.videolan.org/pub/videolan/x265/x265_3.0.tar.gz
     URL_MD5 8ff1780246bb7ac8506239f6129c04ec
 
+    INSTALL_DIR ${EXTPREFIX_heif}
     SOURCE_SUBDIR source/
+    
     CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${EXTPREFIX_heif}
+    
     BUILD_COMMAND make
     INSTALL_COMMAND make install
 
     UPDATE_COMMAND ""
     DEPENDS ext_yasm ext_nasm
 )
 
 ExternalProject_Add(
     ext_libheif
     DOWNLOAD_DIR ${EXTERNALS_DOWNLOAD_DIR}
     URL https://github.com/strukturag/libheif/releases/download/v1.4.0/libheif-1.4.0.tar.gz
     URL_MD5 b3c726609a8750c5fc1687a7b193adff
 
     CONFIGURE_COMMAND <SOURCE_DIR>/configure --prefix=${EXTPREFIX_heif} ${GLOBAL_AUTOMAKE_PROFILE}
 
     BUILD_COMMAND CXXFLAGS="-Wno-error" make
     INSTALL_COMMAND make install
 
     UPDATE_COMMAND ""
     DEPENDS ext_libde265 ext_libx265 ext_pkgconfig
 )