Binary package hint: vzctl
gcc -DPACKAGE_NAME=\"vzctl\" -DPACKAGE_TARNAME=\"vzctl\" -DPACKAGE_VERSION=\"3.0.22\" "-DPACKAGE_STRING=\"vzctl 3.0.22\"" -DPACKAGE_BUGREPORT=\"<email address hidden>\" -DPACKAGE=\"vzctl\" -DVERSION=\"3.0.22\" -DSTDC_HEADERS=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_DLFCN_H=1 -I. -I. -I../../include -DSBINDIR=\"/usr/sbin\" -DPKGCONFDIR=\"/etc/vz\" -DPKGLIBDIR=\"/usr/lib/vzctl\" -Wall -g -O2 -Wall -Wpointer-arith -Wcast-qual -Winline -Wcast-align -Wno-unused-parameter -MT config.lo -MD -MP -MF .deps/config.Tpo -c config.c -fPIC -DPIC -o .libs/config.o
config.c: In function 'parse_ul_sfx':
config.c:530: error: 'LONG_MAX' undeclared (first use in this function)
config.c:530: error: (Each undeclared identifier is reported only once
config.c:530: error: for each function it appears in.)
config.c: In function 'parse_twoul_sfx':
config.c:558: error: 'LONG_MAX' undeclared (first use in this function)
config.c: In function 'write_conf':
config.c:2195: warning: ignoring return value of 'write', declared with attribute warn_unused_result
make[3]: *** [config.lo] Error 1
As the packaging of vzctl directly applies changes to the source, I'd encourage you to do the same and drop the dpatch requirement. Also it'd be nice to forward the change to Debian - other than that: good work!