With [lib]Combine, a CMake file called [lib]Combine-static-config.cmake gets generated. Such a CMake file cannot be found on a case-sensitive system (since that kind of filename should be all lower case). Instead, a CMake file called [lib]combine-static-config.cmake should be generated, hence the suggestion to rename the library to [lib]combine, not least so that it's consistent with libSBML, for instance.