File help.patch of Package f3d

Index: f3d-3.2.0/application/CMakeLists.txt
===================================================================
--- f3d-3.2.0.orig/application/CMakeLists.txt
+++ f3d-3.2.0/application/CMakeLists.txt
@@ -215,7 +215,7 @@ if(UNIX AND NOT APPLE)
       set(MAN_OUTPUT_FILE ${CMAKE_BINARY_DIR}/f3d.1)
       add_custom_command(
         OUTPUT ${MAN_OUTPUT_FILE}
-        COMMAND ${HELP2MAN} $<TARGET_FILE:f3d> -N -n "fast and minimalist 3D viewer" > ${MAN_OUTPUT_FILE}
+        COMMAND ${HELP2MAN} --no-discard-stderr $<TARGET_FILE:f3d> -N -n "fast and minimalist 3D viewer" > ${MAN_OUTPUT_FILE}
         COMMAND ${GZIP} -fn ${MAN_OUTPUT_FILE}
         DEPENDS f3d)
       add_custom_target(man ALL DEPENDS ${MAN_OUTPUT_FILE})