Merge pull request #512 from Jordan08/dev-clean-v2-40

Add the DEB CPack generator only when dpkg-deb is available

Author: SimonRohou

CMakeLists.txt

@@ -217,7 +217,15 @@
 # Archives and packages
 ################################################################################
 
-  set(CPACK_GENERATOR "TGZ" "ZIP" "DEB")
+  set(CPACK_GENERATOR "TGZ" "ZIP")
+  # The DEB generator shells out to dpkg-deb, which only exists on
+  # Debian-based systems -- adding it unconditionally would make `cpack`/
+  # `make package` fail on Windows, macOS, and non-Debian Linux, even
+  # though nothing else in the build depends on it.
+  find_program(DPKG_DEB_EXECUTABLE dpkg-deb)
+  if(DPKG_DEB_EXECUTABLE)
+    list(APPEND CPACK_GENERATOR "DEB")
+  endif()
   string(TOLOWER "${CMAKE_PROJECT_NAME}" CPACK_PACKAGE_NAME)
   set(CPACK_PACKAGE_VENDOR "Codac Team")
   set(CPACK_PACKAGE_DESCRIPTION_SUMMARY ${CODAC_DESCRIPTION})