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[...]
checking for a BSD compatible install... /usr/bin/install -c
checking where to install library... /usr/lib
checking where to install headers... /usr/include
creating make.system
creating ./config.status
creating Makefile
creating make.defs
creating tests/Makefile
creating tools/Makefile
renaming make.defs to make.LINUX64
/usr/bin/make  -C .  
make[1]: Entering directory `/build/buildd/libcgns-2.5.4'
mkdir LINUX64
cc -g -g -O2 -g -Wall -O2 -m64 -fPIC  -I. -Iadfh -o LINUX64/adf_cond.o -c adf_cond.c
cc1: error: unrecognized command line option "-m64"
make[1]: *** [LINUX64/adf_cond.o] Error 1
make[1]: Leaving directory `/build/buildd/libcgns-2.5.4'
make: *** [debian/stamp-makefile-build] Error 2
dpkg-buildpackage: error: debian/rules build gave error exit status 2