After last boost update got:
ld-elf.so.1: Shared object "libboost_regex.so.1.70.0" not found, required by "gdb"
Rebuild and reinstall gdb fixes proublem.
Needs bump of portrevision.
(In reply to Walter Schwarzenfeld from comment #1)
There is no boost dep in make file.
pkg info -d source-highlight
Probably need add boost to LIB_DEPEND to gdb Makefile to keep this.
IMHO, gdb linked with libboost_regex.so.
If it is not true than close this as noabug/wontfix.