diff --git a/deps/CMakeLists.txt b/deps/CMakeLists.txt
index 77cae3382..0548e405e 100644
--- a/deps/CMakeLists.txt
+++ b/deps/CMakeLists.txt
@@ -340,6 +340,20 @@ if(NOT FREETYPE_FOUND)
     set(FREETYPE_PKG "dep_FREETYPE") 
 endif()
 
+execute_process(
+    COMMAND ${GIT_EXECUTABLE} rev-parse --is-inside-work-tree
+    RESULT_VARIABLE REV_PARSE_RESULT
+    OUTPUT_VARIABLE REV_PARSE_OUTPUT
+    OUTPUT_STRIP_TRAILING_WHITESPACE
+)
+
+# Will output "true" and have a 0 return code if within a git repo
+if((REV_PARSE_RESULT EQUAL 0) AND (REV_PARSE_OUTPUT STREQUAL "true"))
+    set(IN_GIT_REPO TRUE)
+    # Find relative path from root to source used for adjusting patch command
+    file(RELATIVE_PATH BINARY_DIR_REL  ${CMAKE_SOURCE_DIR}/.. ${CMAKE_BINARY_DIR})
+endif ()
+
 include(OCCT/OCCT.cmake)
 include(OpenCV/OpenCV.cmake)
 
diff --git a/deps/OCCT/OCCT.cmake b/deps/OCCT/OCCT.cmake
index 096da413d..98c6efc98 100644
--- a/deps/OCCT/OCCT.cmake
+++ b/deps/OCCT/OCCT.cmake
@@ -4,15 +4,15 @@ else()
     set(library_build_type "Static")
 endif()
 
-
-# get relative path of CMAKE_BINARY_DIR against root source directory
-file(RELATIVE_PATH BINARY_DIR_REL  ${CMAKE_SOURCE_DIR}/.. ${CMAKE_BINARY_DIR})
+if (IN_GIT_REPO)
+    set(OCCT_DIRECTORY_FLAG --directory ${BINARY_DIR_REL}/dep_OCCT-prefix/src/dep_OCCT)
+endif ()
 
 orcaslicer_add_cmake_project(OCCT
     URL https://github.com/Open-Cascade-SAS/OCCT/archive/refs/tags/V7_6_0.zip
     URL_HASH SHA256=28334f0e98f1b1629799783e9b4d21e05349d89e695809d7e6dfa45ea43e1dbc
     #PATCH_COMMAND ${PATCH_CMD} ${CMAKE_CURRENT_LIST_DIR}/0001-OCCT-fix.patch
-    PATCH_COMMAND git apply --directory ${BINARY_DIR_REL}/dep_OCCT-prefix/src/dep_OCCT --verbose --ignore-space-change --whitespace=fix ${CMAKE_CURRENT_LIST_DIR}/0001-OCCT-fix.patch
+    PATCH_COMMAND git apply ${OCCT_DIRECTORY_FLAG} --verbose --ignore-space-change --whitespace=fix ${CMAKE_CURRENT_LIST_DIR}/0001-OCCT-fix.patch
     #DEPENDS dep_Boost
     DEPENDS ${FREETYPE_PKG}
     CMAKE_ARGS
diff --git a/deps/OpenCV/OpenCV.cmake b/deps/OpenCV/OpenCV.cmake
index 6d62b018a..23cbafa2a 100644
--- a/deps/OpenCV/OpenCV.cmake
+++ b/deps/OpenCV/OpenCV.cmake
@@ -4,10 +4,14 @@ else ()
     set(_use_IPP "-DWITH_IPP=OFF")
 endif ()
 
+if (IN_GIT_REPO)
+    set(OpenCV_DIRECTORY_FLAG --directory ${BINARY_DIR_REL}/dep_OpenCV-prefix/src/dep_OpenCV)
+endif ()
+
 orcaslicer_add_cmake_project(OpenCV
     URL https://github.com/opencv/opencv/archive/refs/tags/4.6.0.tar.gz
     URL_HASH SHA256=1ec1cba65f9f20fe5a41fda1586e01c70ea0c9a6d7b67c9e13edf0cfe2239277
-    PATCH_COMMAND git apply --directory ${BINARY_DIR_REL}/dep_OpenCV-prefix/src/dep_OpenCV --verbose --ignore-space-change --whitespace=fix ${CMAKE_CURRENT_LIST_DIR}/0001-vs2022.patch
+    PATCH_COMMAND git apply ${OpenCV_DIRECTORY_FLAG} --verbose --ignore-space-change --whitespace=fix ${CMAKE_CURRENT_LIST_DIR}/0001-vs2022.patch
     CMAKE_ARGS
     -DBUILD_SHARED_LIBS=0
        -DBUILD_PERE_TESTS=OFF