system/cfengine: Fix build when avahi installed.

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

system/cfengine/README

@@ -2,3 +2,6 @@ cfengine (Automate and manage your IT infrastructure)
 
 CFEngine is a configuration management and automation framework that
 lets you securely manage your mission critical IT infrastructure.
+
+Optional dependency: if avahi is installed, cfengine will be built
+with support for it.

system/cfengine/cfengine.SlackBuild

@@ -22,6 +22,9 @@
 #  OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 #  ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
+# 20220405 bkw: Modified by SlackBuilds.org, BUILD=2:
+# - fix build when avahi is installed, and document avahi as optional.
+
 # 20220211 bkw: Modified by SlackBuilds.org: update for v3.15.2 since
 # the previous version wouldn't build on Slackware 15.0.
 
@@ -29,7 +32,7 @@ cd $(dirname $0) ; CWD=$(pwd)
 
 PRGNAM=cfengine
 VERSION=${VERSION:-3.15.2}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 PKGTYPE=${PKGTYPE:-tgz}
 
@@ -79,6 +82,8 @@ find -L . \
  \( -perm 666 -o -perm 664 -o -perm 640 -o -perm 600 -o -perm 444 \
   -o -perm 440 -o -perm 400 \) -exec chmod 644 {} \+
 
+SLKCFLAGS+=" -fcommon"
+
 CFLAGS="$SLKCFLAGS" \
 CXXFLAGS="$SLKCFLAGS" \
 ./configure \
@@ -93,7 +98,7 @@ CXXFLAGS="$SLKCFLAGS" \
   --enable-shared=yes \
   --build=$ARCH-slackware-linux
 
-make
+make V=1
 make install-strip DESTDIR=$PKG
 rm -f $PKG/usr/lib*/*.la