Source: postgresql-13 Severity: minor It seems postgresql configure scripts detects awk in the order of gawk, mawk, nawk, awk, which then writes the resulting *awk into /usr/lib/postgresql/13/lib/pgxs/src/Makefile.global . Thus if postgresql detects gawk during building process and a downstream plugin package declares the build dependency of mawk as usual, it will FTBFS. Please add Build-Conflicts to gawk to postgresql-13.