Hi! I don't own a Darwin system, so I can't help much reproduce. However, I've received a bug report to the Linux man-pages, that our build system (GNUmakefile-based), which ends up calling ... | install /dev/stdin $@ doesn't work on Darwin. Here's the original bug report: . Here are the reported error messages: ... INSTALL /nix/store/3s28l9ijlkmsq8256zdxjvl173gkn37c-man-pages-6.7/share/man/man3/addseverity.3 INSTALL /nix/store/3s28l9ijlkmsq8256zdxjvl173gkn37c-man-pages-6.7/share/man/man3/adjtime.3 install: skipping file '/dev/stdin', as it was replaced while being copied make: *** [share/mk/install/man.mk:54: /nix/store/3s28l9ijlkmsq8256zdxjvl173gkn37c-man-pages-6.7/share/man/man3/addmntent.3] Error 1 make: *** Waiting for unfinished jobs.... install: skipping file '/dev/stdin', as it was replaced while being copied make: *** [share/mk/install/man.mk:54: /nix/store/3s28l9ijlkmsq8256zdxjvl173gkn37c-man-pages-6.7/share/man/man3/acosh.3] Error 1 install: skipping file '/dev/stdin', as it was replaced while being copied install: skipping file '/dev/stdin', as it was replaced while being copied install: skipping file '/dev/stdin', as it was replaced while being copied ... I don't see why install(1) should fail to read /dev/stdin under any POSIX system. Reported-by: Mario Rodas Reported-by: Sergei Trofimovich Reported-by: Alejandro Colomar Cc: Eli Schwartz Have a lovely day! Alex --