diff -urN openscad-9999.orig/cmake/Modules/FindLib3MF.cmake openscad-9999/cmake/Modules/FindLib3MF.cmake
--- openscad-9999.orig/cmake/Modules/FindLib3MF.cmake	2021-09-29 09:08:23.870290708 +0200
+++ openscad-9999/cmake/Modules/FindLib3MF.cmake	2021-09-29 09:20:36.077846758 +0200
@@ -14,11 +14,11 @@
 # Travis CI Ubuntu Trusty environment has some issue with pkg-config
 # not finding the version.
 find_package(PkgConfig REQUIRED QUIET)
-pkg_check_modules(PC_LIB3MF lib3MF)
+pkg_check_modules(PC_LIB3MF lib3mf)
 set(LIB3MF_VERSION ${PC_LIB3MF_VERSION})
 
 find_path(LIB3MF_INCLUDE_DIRS
-    NAMES Model/COM/NMR_DLLInterfaces.h
+    NAMES lib3mf_implicit.hpp
     HINTS $ENV{LIB3MF_INCLUDEDIR}
           ${PC_LIB3MF_INCLUDEDIR}
           ${PC_LIB3MF_INCLUDE_DIRS}