Don't run tools/toc2bkm.py unless we're building PDF.

Change the way TEXINPUTS gets defined to ensure that the directory containing
the main document file comes before any other dir, to allow documents to have
files that "override" like-named files elsewhere on the search path.  Guido
discovered we needed this.

Doc/tools/mkhowto.sh

@@ -15,11 +15,6 @@ DISCARD_TEMPS=true
 
 L2H_INIT_FILE=$TOPDIR/perl/l2hinit.perl
 
-# This is needed to support kpathsea based TeX installations.  Others are
-# not supported.  ;-)
-TEXINPUTS=$TOPDIR/texinputs:$TEXINPUTS
-export TEXINPUTS
-
 LOGFILE=/usr/tmp/mkhowto-$LOGNAME-$$.how
 LOGGING=''
 
@@ -107,7 +102,7 @@ use_latex() {
 	$MYDIR/fix_hack $MYFILE.idx || exit $?
 	makeindex -s $TOPDIR/texinputs/myindex.ist $MYFILE.idx || exit $?
     fi
-    if [ -f $MYFILE.toc ] ; then
+    if [ -f $MYFILE.toc -a $MYLATEX = pdflatex ] ; then
 	$MYDIR/toc2bkm.py -c section $MYFILE
     fi
     $MYLATEX $MYFILE || exit $?
@@ -222,8 +217,18 @@ if [ "$QUIET" ] ; then
     exec >/dev/null
 fi
 
+COMMONTEXINPUTS=$TOPDIR/texinputs:$TEXINPUTS
+
 for FILE in $@ ; do
     FILE=`basename ${FILE%.tex}`
+    #
+    # Put the directory the .tex file is in is also the first directory in
+    # TEXINPUTS, to allow files there to override files in the common area.
+    #
+    FILEDIR=`dirname $FILE`
+    TEXINPUTS=$FILEDIR:$COMMONTEXINPUTS
+    export TEXINPUTS
+    #
     if [ "$BUILD_DVI" -o "$BUILD_PS" ] ; then
 	build_dvi $FILE 2>&1 | tee -a $LOGFILE
     fi