master 31226b0: Only look for the port command on MacOS

[Lars Ingebrigtsen]

branch: master
commit 31226b034136769723c69679a4a302299fbb9e7b
Author: Lars Ingebrigtsen <larsi@gnus.org>
Commit: Lars Ingebrigtsen <larsi@gnus.org>

    Only look for the port command on MacOS
    
    * configure.ac: Only look for the port command on MacOS (bug#50259).
---
 configure.ac | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index a1deb7b..6d204b6 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1335,7 +1335,9 @@ if test -n "$BREW"; then
 fi
 
 # Check MacPorts on macOS.
-AC_PATH_PROG(HAVE_MACPORTS, port)
+if test $opsys = darwin; then
+  AC_PATH_PROG(HAVE_MACPORTS, port)
+fi
 
 ## Require makeinfo >= 4.13 (last of the 4.x series) to build the manuals.
 : ${MAKEINFO:=makeinfo}