Fake it until we supported
Index: kde-modules/KDEMetaInfoPlatformCheck.cmake
--- kde-modules/KDEMetaInfoPlatformCheck.cmake.orig
+++ kde-modules/KDEMetaInfoPlatformCheck.cmake
@@ -38,8 +38,12 @@ if (NOT "${KF_IGNORE_PLATFORM_CHECK}")
                 if (CMAKE_SYSTEM_NAME MATCHES "Linux")
                     set(_MetainfoFoundSupportedPlatform true)
                 endif()
+            elseif (${CMAKE_MATCH_1} STREQUAL "OpenBSD")
+                if (CMAKE_SYSTEM_NAME MATCHES "OpenBSD")
+                    set(_MetainfoFoundSupportedPlatform true)
+                endif()
             elseif (${CMAKE_MATCH_1} STREQUAL "FreeBSD")
-                if (CMAKE_SYSTEM_NAME MATCHES "FreeBSD")
+                if (CMAKE_SYSTEM_NAME MATCHES "OpenBSD")
                     set(_MetainfoFoundSupportedPlatform true)
                 endif()
             elseif (${CMAKE_MATCH_1} STREQUAL "OpenBSD")