GCC 8 complains that it can't find relevant functions:
/wrkdirs/usr/ports/games/gzdoom/work/gzdoom-g3.7.2/src/m_png.cpp:669:42: error: call of overloaded 'BigLong(uint32_t)' is ambiguous
chunklen = BigLong((unsigned int)x[1]);
^
In file included from /wrkdirs/usr/ports/games/gzdoom/work/gzdoom-g3.7.2/src/m_png.cpp:44:
/wrkdirs/usr/ports/games/gzdoom/work/gzdoom-g3.7.2/src/m_swap.h:212:15: note: candidate: 'long unsigned int BigLong(long unsigned int)' <deleted>
unsigned long BigLong(unsigned long) = delete;
^~~~~~~
/wrkdirs/usr/ports/games/gzdoom/work/gzdoom-g3.7.2/src/m_swap.h:213:6: note: candidate: 'long int BigLong(long int)' <deleted>
long BigLong(long) = delete;
This is on FreeBSD/powerpc64.