In case zlib not found by pkg-config(1) the pkg-config information is resolved by attempting to print ZLIB_VERSION from from zlib installation if it exists anyway. If above done successfully compat/zlib.pc is written for forthcoming pkg-config execution. Since `set -u` is in effect (since 124a67e96, 2016-05-06), expanding unset $PKG_CONFIG_PATH (would have) failed whenever tried. Now it is changed to set as "$PKG_CONFIG_PATH:compat" if PKG_CONFIG_PATH is set and is non-empty string, plain "compat" otherwise. --- configure | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/configure b/configure index 2160be37..00a9d03d 100755 --- a/configure +++ b/configure @@ -606,7 +606,7 @@ fi if ! pkg-config --exists zlib; then ${CC} -o compat/gen_zlib_pc "$srcdir"/compat/gen_zlib_pc.c >/dev/null 2>&1 && compat/gen_zlib_pc > compat/zlib.pc && - PKG_CONFIG_PATH="$PKG_CONFIG_PATH":compat && + PKG_CONFIG_PATH=${PKG_CONFIG_PATH:+$PKG_CONFIG_PATH:}compat && export PKG_CONFIG_PATH rm -f compat/gen_zlib_pc fi -- 2.23.0 _______________________________________________ notmuch mailing list notmuch@notmuchmail.org https://notmuchmail.org/mailman/listinfo/notmuch