* Loosen the error around USE_ANT and do-build [1]
* Add a check for CFLAGS and CXXFLAGS in CONFIGURE_ENV [2]
* Add a check for Fortran flags in CONFIGURE_ENV [3]
PR: 128482 [2]
Requested by: Dominic Fandrey <kamikaze@bsdforen.de> [1]
gerlad [3]
Submitted by: amdmi3 [2]
