+# Search for a program to preview pdf
+echo $ac_n "checking for a PDF preview""... $ac_c"
+echo "$ac_t""(acroread gv ghostview xpdf)"
+PDF_VIEWER=
+for ac_prog in acroread gv ghostview xpdf
+do
+# Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog ; ac_word=$2
+if test -n "$ac_word"; then
+ echo $ac_n "+checking for \"$ac_word\"""... $ac_c"
+ IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS=":"
+ for ac_dir in $PATH; do
+ test -z "$ac_dir" && ac_dir=.
+ if test -x $ac_dir/$ac_word; then
+ PDF_VIEWER="$ac_prog"
+ break
+ fi
+ done
+ IFS="$ac_save_ifs"
+
+ if test -n "$PDF_VIEWER"; then
+ ac_result=yes
+ else
+ ac_result=no
+ fi
+
+ echo "$ac_t""$ac_result"
+ test -n "$PDF_VIEWER" && break
+fi
+done
+
+if test -z "$PDF_VIEWER" ; then
+ PDF_VIEWER=none
+fi
+
+
+# Search something to preview dvi
+echo $ac_n "checking for a DVI previewer""... $ac_c"
+echo "$ac_t""(xdvi)"
+DVI_VIEWER=
+for ac_prog in xdvi
+do
+# Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog ; ac_word=$2
+if test -n "$ac_word"; then
+ echo $ac_n "+checking for \"$ac_word\"""... $ac_c"
+ IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS=":"
+ for ac_dir in $PATH; do
+ test -z "$ac_dir" && ac_dir=.
+ if test -x $ac_dir/$ac_word; then
+ DVI_VIEWER="$ac_prog"
+ break
+ fi
+ done
+ IFS="$ac_save_ifs"
+
+ if test -n "$DVI_VIEWER"; then
+ ac_result=yes
+ else
+ ac_result=no
+ fi
+
+ echo "$ac_t""$ac_result"
+ test -n "$DVI_VIEWER" && break
+fi
+done
+
+if test -z "$DVI_VIEWER" ; then
+ DVI_VIEWER=none
+fi
+
+
+# Search something to preview html
+echo $ac_n "checking for a HTML previewer""... $ac_c"
+echo "$ac_t""(netscape)"
+HTML_VIEWER=
+for ac_prog in netscape
+do
+# Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog ; ac_word=$2
+if test -n "$ac_word"; then
+ echo $ac_n "+checking for \"$ac_word\"""... $ac_c"
+ IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS=":"
+ for ac_dir in $PATH; do
+ test -z "$ac_dir" && ac_dir=.
+ if test -x $ac_dir/$ac_word; then
+ HTML_VIEWER="$ac_prog"
+ break
+ fi
+ done
+ IFS="$ac_save_ifs"
+
+ if test -n "$HTML_VIEWER"; then
+ ac_result=yes
+ else
+ ac_result=no
+ fi
+
+ echo "$ac_t""$ac_result"
+ test -n "$HTML_VIEWER" && break
+fi
+done
+
+if test -z "$HTML_VIEWER" ; then
+ HTML_VIEWER=none
+fi
+
+
+# Search for a program to convert ps to pdf
+echo $ac_n "checking for a PS to PDF converter""... $ac_c"
+echo "$ac_t""(ps2pdf)"
+ps_to_pdf_command=
+for ac_prog in ps2pdf
+do
+# Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog ; ac_word=$2
+if test -n "$ac_word"; then
+ echo $ac_n "+checking for \"$ac_word\"""... $ac_c"
+ IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS=":"
+ for ac_dir in $PATH; do
+ test -z "$ac_dir" && ac_dir=.
+ if test -x $ac_dir/$ac_word; then
+ ps_to_pdf_command="$ac_prog"
+ break
+ fi
+ done
+ IFS="$ac_save_ifs"
+
+ if test -n "$ps_to_pdf_command"; then
+ ac_result=yes
+ else
+ ac_result=no
+ fi
+
+ echo "$ac_t""$ac_result"
+ test -n "$ps_to_pdf_command" && break
+fi
+done
+
+if test -z "$ps_to_pdf_command" ; then
+ ps_to_pdf_command=none
+fi
+
+test $ps_to_pdf_command = "ps2pdf" && ps_to_pdf_command="ps2pdf \$\$i"
+
+# Search for a program to convert dvi to ps
+echo $ac_n "checking for a DVI to PS converter""... $ac_c"
+echo "$ac_t""(dvips)"
+dvi_to_ps_command=
+for ac_prog in dvips
+do
+# Extract the first word of "$ac_prog", so it can be a program name with args.
+set dummy $ac_prog ; ac_word=$2
+if test -n "$ac_word"; then
+ echo $ac_n "+checking for \"$ac_word\"""... $ac_c"
+ IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS=":"
+ for ac_dir in $PATH; do
+ test -z "$ac_dir" && ac_dir=.
+ if test -x $ac_dir/$ac_word; then
+ dvi_to_ps_command="$ac_prog"
+ break
+ fi
+ done
+ IFS="$ac_save_ifs"
+
+ if test -n "$dvi_to_ps_command"; then
+ ac_result=yes
+ else
+ ac_result=no
+ fi
+
+ echo "$ac_t""$ac_result"
+ test -n "$dvi_to_ps_command" && break
+fi
+done
+
+if test -z "$dvi_to_ps_command" ; then
+ dvi_to_ps_command=none
+fi
+
+test $dvi_to_ps_command = "dvips" && dvi_to_ps_command="dvips -o \$\$o \$\$i"
+