games/wesnoth: Fix 15.0 build, better parallel support.

Signed-off-by: B. Watson <yalhcru@gmail.com>

games/wesnoth/wesnoth.SlackBuild

@@ -33,7 +33,6 @@ VERSION=${VERSION:-1.16.1}
 BUILD=${BUILD:-1}
 TAG=${TAG:-_SBo}
 PKGTYPE=${PKGTYPE:-tgz}
-NUMJOBs=${NUMJOBS:-1}
 
 if [ -z "$ARCH" ]; then
   case "$( uname -m )" in
@@ -43,9 +42,6 @@ if [ -z "$ARCH" ]; then
   esac
 fi
 
-# If the variable PRINT_PACKAGE_NAME is set, then this script will report what
-# the name of the created package would be, and then exit. This information
-# could be useful to other scripts.
 if [ ! -z "${PRINT_PACKAGE_NAME}" ]; then
   echo "$PRGNAM-$VERSION-$ARCH-$BUILD$TAG.$PKGTYPE"
   exit 0
@@ -77,6 +73,20 @@ fi
 
 set -e
 
+if [ -z "$NUMJOBS" ]; then
+  # 20220221 bkw: everything else respects MAKEFLAGS, set NUMJOBS here
+  # from environment MAKEFLAGS, if we can...
+  NUMJOBS="$( echo $MAKEFLAGS | sed 's,.*-j *\([0-9][0-9]*\).*,\1,' )"
+
+  # ...if not, cores - 1:
+  [ -z "$NUMJOBS" ] && NUMJOBS=$(( $( nproc ) - 1 ))
+
+  # ...but not if we only had one core!
+  [ "$NUMJOBS" = "0" ] && NUMJOBS=1
+fi
+
+echo "=== NUMJOBS='$NUMJOBS'"
+
 rm -rf $PKG
 mkdir -p $TMP $PKG $OUTPUT
 rm -rf $TMP/$PRGNAM-$VERSION
@@ -87,9 +97,9 @@ cd $PRGNAM-$VERSION
 chown -R root:root .
 find -L . \
  \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \
-  -o -perm 511 \) -exec chmod 755 {} \; -o \
+  -o -perm 511 \) -exec chmod 755 {} \+ -o \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
-  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \;
+  -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \+
 
 scons \
  CXXFLAGS="$SLKCFLAGS" \