diff --git a/ports/opencascade/CONTROL b/ports/opencascade/CONTROL
index 998252a3fbc..11df638352d 100644
--- a/ports/opencascade/CONTROL
+++ b/ports/opencascade/CONTROL
@@ -1,5 +1,6 @@
 Source: opencascade
 Version: 7.5.0
+Port-Version: 1
 Build-Depends: freetype
 Description: Open CASCADE Technology (OCCT) is an open-source software development platform for 3D CAD, CAM, CAE.
 Supports: !(uwp|osx|linux|arm)
diff --git a/ports/opencascade/fix-install-prefix-path.patch b/ports/opencascade/fix-install-prefix-path.patch
new file mode 100644
index 00000000000..f523280ac9e
--- /dev/null
+++ b/ports/opencascade/fix-install-prefix-path.patch
@@ -0,0 +1,15 @@
+diff --git a/adm/templates/OpenCASCADEConfig.cmake.in b/adm/templates/OpenCASCADEConfig.cmake.in
+index e391ddf..c926c49 100644
+--- a/adm/templates/OpenCASCADEConfig.cmake.in
++++ b/adm/templates/OpenCASCADEConfig.cmake.in
+@@ -24,6 +24,7 @@ set (OpenCASCADE_DEVELOPMENT_VERSION "@OCC_VERSION_DEVELOPMENT@")
+ # - in Android style: $INSTALL_DIR/libs/$CMAKE_ANDROID_ARCH_ABI/cmake/opencascade-<version>
+ get_filename_component (OpenCASCADE_INSTALL_PREFIX "${CMAKE_CURRENT_LIST_FILE}" PATH)
+ get_filename_component (OpenCASCADE_INSTALL_PREFIX "${OpenCASCADE_INSTALL_PREFIX}" PATH)
++get_filename_component (OpenCASCADE_INSTALL_PREFIX "${OpenCASCADE_INSTALL_PREFIX}" PATH)
+ if (OpenCASCADE_INSTALL_PREFIX MATCHES "/cmake$")
+   get_filename_component (OpenCASCADE_INSTALL_PREFIX "${OpenCASCADE_INSTALL_PREFIX}" PATH)
+ endif()
+-- 
+2.14.3.windows.1
+
diff --git a/ports/opencascade/install-include-dir.patch b/ports/opencascade/install-include-dir.patch
new file mode 100644
index 00000000000..85ab582bd34
--- /dev/null
+++ b/ports/opencascade/install-include-dir.patch
@@ -0,0 +1,31 @@
+From 32c4bdd88555309752215c53842d438cb51bcb62 Mon Sep 17 00:00:00 2001
+From: bloess <josua.bloess@uni-bayreuth.de>
+Date: Mon, 15 Feb 2021 16:26:36 +0100
+Subject: [PATCH] install include-dir
+
+---
+ CMakeLists.txt | 9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+diff --git a/CMakeLists.txt b/CMakeLists.txt
+index 100d613..464f95a 100644
+--- a/CMakeLists.txt
++++ b/CMakeLists.txt
+@@ -1171,6 +1171,14 @@ foreach (OCCT_MODULE ${OCCT_MODULES})
+ endforeach()
+ set (OCCT_MODULES_ENABLED ${OCCT_MODULES_ENABLED_SORTED})
+ 
++foreach (OCCT_LIBRARY ${OCCT_LIBRARIES})
++	target_include_directories(
++		${OCCT_LIBRARY} 
++		INTERFACE
++		$<INSTALL_INTERFACE:include>)
++
++endforeach()
++
+ # Add all targets to the build-tree export set
+ export (TARGETS ${OCCT_LIBRARIES} FILE "${CMAKE_BINARY_DIR}/OpenCASCADETargets.cmake")
+ 
+-- 
+2.14.3.windows.1
+
diff --git a/ports/opencascade/portfile.cmake b/ports/opencascade/portfile.cmake
index 68bb5639783..86fc2a34eb8 100644
--- a/ports/opencascade/portfile.cmake
+++ b/ports/opencascade/portfile.cmake
@@ -8,6 +8,8 @@ vcpkg_from_github(
     HEAD_REF master
     PATCHES
         fix-pdb-find.patch
+        fix-install-prefix-path.patch
+        install-include-dir.patch
 )
 
 if (VCPKG_LIBRARY_LINKAGE STREQUAL dynamic)
@@ -43,7 +45,28 @@ vcpkg_configure_cmake(
 
 vcpkg_install_cmake()
 
-vcpkg_fixup_cmake_targets(CONFIG_PATH lib/cmake/opencascade TARGET_PATH share/opencascade)
+vcpkg_fixup_cmake_targets(CONFIG_PATH lib/cmake/opencascade)
+
+#make occt includes relative to source_file
+list(APPEND ADDITIONAL_HEADERS 
+      "ExprIntrp.tab.h"
+	  "FlexLexer.h"
+	  "glext.h"
+	  "igesread.h"
+	  "NCollection_Haft.h"
+	  "OSD_PerfMeter.h"
+	  "Standard_values.h"
+    )
+
+file(GLOB files "${CURRENT_PACKAGES_DIR}/include/opencascade/[a-zA-Z0-9_]*\.[hgl]xx")
+foreach(file_name ${files})
+	file(READ ${file_name} filedata)
+	string(REGEX REPLACE "# *include \<([a-zA-Z0-9_]*\.[hgl]xx)\>" "#include \"\\1\"" filedata "${filedata}")
+	foreach(extra_header ${ADDITIONAL_HEADERS})
+		string(REGEX REPLACE "# *include \<${extra_header}\>" "#include \"${extra_header}\"" filedata "${filedata}")
+	endforeach()
+	file(WRITE ${file_name} "${filedata}")
+endforeach()
 
 # Remove libd to lib, libd just has cmake files we dont want too
 file(REMOVE_RECURSE ${CURRENT_PACKAGES_DIR}/debug/lib)
diff --git a/versions/baseline.json b/versions/baseline.json
index bfd69aba818..88c5942b17f 100644
--- a/versions/baseline.json
+++ b/versions/baseline.json
@@ -4302,7 +4302,7 @@
     },
     "opencascade": {
       "baseline": "7.5.0",
-      "port-version": 0
+      "port-version": 1
     },
     "opencc": {
       "baseline": "2020-04-26",
diff --git a/versions/o-/opencascade.json b/versions/o-/opencascade.json
index cf3e61041fa..41455245125 100644
--- a/versions/o-/opencascade.json
+++ b/versions/o-/opencascade.json
@@ -1,5 +1,10 @@
 {
   "versions": [
+    {
+      "git-tree": "1afbbcf0d6d85963a334b8ae8e95b4fe16a9ff5b",
+      "version-string": "7.5.0",
+      "port-version": 1
+    },
     {
       "git-tree": "0d003408ab69f77a4ca2c02de115087c87a46b27",
       "version-string": "7.5.0",