--- CMakeLists.txt.orig	2023-06-19 12:07:14 UTC
+++ CMakeLists.txt
@@ -4,6 +4,7 @@ include(CMakeDependentOption)
 include("version.inc")
 include(GNUInstallDirs)
 include(CMakeDependentOption)
+add_compile_options(-DNDEBUG)
 
 set(SLIC3R_RESOURCES_DIR "${CMAKE_CURRENT_SOURCE_DIR}/resources")
 file(TO_NATIVE_PATH "${SLIC3R_RESOURCES_DIR}" SLIC3R_RESOURCES_DIR_WIN)
@@ -207,7 +208,7 @@ endif ()
     endif ()
 endif ()
 
-if (CMAKE_SYSTEM_NAME STREQUAL "Linux")
+if (CMAKE_SYSTEM_NAME STREQUAL "Linux" OR CMAKE_SYSTEM_NAME STREQUAL "FreeBSD")
     find_package(PkgConfig REQUIRED)
 
     if (CMAKE_VERSION VERSION_LESS "3.1")
@@ -446,7 +447,7 @@ find_package(EXPAT REQUIRED)
 # no matter what.
 find_package(EXPAT REQUIRED)
 
-add_library(libexpat INTERFACE)
+# add_library(libexpat INTERFACE)
 
 if (TARGET EXPAT::EXPAT )
     target_link_libraries(libexpat INTERFACE EXPAT::EXPAT)
@@ -627,8 +628,8 @@ elseif (SLIC3R_FHS)
     install(DIRECTORY ${SLIC3R_RESOURCES_DIR}/ DESTINATION ${SLIC3R_FHS_RESOURCES}
         PATTERN "*/udev" EXCLUDE
     )
-    install(FILES src/platform/unix/PrusaSlicer.desktop DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/applications)
-    install(FILES src/platform/unix/PrusaGcodeviewer.desktop DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/applications)
+	install(FILES src/platform/unix/PrusaSlicer.desktop DESTINATION share/applications)
+	install(FILES src/platform/unix/PrusaGcodeviewer.desktop DESTINATION share/applications)
     foreach(SIZE 32 128 192)
         install(FILES ${SLIC3R_RESOURCES_DIR}/icons/PrusaSlicer_${SIZE}px.png
             DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/${SIZE}x${SIZE}/apps RENAME PrusaSlicer.png
@@ -637,7 +638,8 @@ elseif (SLIC3R_FHS)
             DESTINATION ${CMAKE_INSTALL_DATAROOTDIR}/icons/hicolor/${SIZE}x${SIZE}/apps RENAME PrusaSlicer-gcodeviewer.png
         )
     endforeach()
-    install(DIRECTORY ${SLIC3R_RESOURCES_DIR}/udev/ DESTINATION lib/udev/rules.d)
+	#FreeBSD doesn't have a udev
+	#install(DIRECTORY ${SLIC3R_RESOURCES_DIR}/udev/ DESTINATION lib/udev/rules.d)
 else ()
     install(FILES src/platform/unix/PrusaSlicer.desktop DESTINATION ${CMAKE_INSTALL_PREFIX}/resources/applications)
     install(FILES src/platform/unix/PrusaGcodeviewer.desktop DESTINATION ${CMAKE_INSTALL_PREFIX}/resources/applications)