Proper thing to do here would most likely be to use AC_CHECK_PROG([DB2HTML], [db2html docbook2html], ...) and use the $(DB2HTML) variable in Makefile.am.

ok I just checked that our package does not provide db2pdf equivalent. Is this supposed to be shipped in the tarball itself btw ?

I got docbook2pdf from docbook-utils package in OpenSUSE, not sure where it comes from other than that :-\

Fixed the configure checks and tutorial makefiles in both gmime-2.4 and 2.6 branches.

will be making a new release with these fixes today.

Sadly, looks like it still fails to detect it properly, I see the following in configure:

checking for docbook2html... /usr/bin/docbook2html
Usage: jw [<options>] <sgml_file>
where <options> are:
  -f|--frontend <frontend>: 	 Specify the frontend (source format)
  				 (default is docbook)
  -b|--backend <backend>: 	 Specify the backend (destination format)
  				 (default is html)
  -c|--cat <file>: 		 Specify an extra SGML open catalog
  -n|--nostd: 			 Do not use the standard SGML open catalogs
  -d|--dsl <file>|default|none:	 Specify an alternate style sheet
  				 (default is to use the default stylesheet)
  -l|--dcl <file>: 		 Specify an alternate SGML declaration
  				 (usual ones like xml.dcl get detected automatically)
  -s|--sgmlbase <path>: 	 Change base directory for SGML distribution
  				 (usually /usr/share/sgml)
  -p|--parser <program>: 	 Specify the parser if several are installed
  				 (jade or openjade)
  -o|--output <directory>: 	 Set output directory
  -u|--nochunks: 		 Output only one big file
  				 (overrides the stylesheet settings)
  -i|--include <section>: 	 Specify a SGML marked section to include
  				 (should be marked as "ignore" in the SGML text)
  -w|--warning <warning_type>|list: Control warnings or display the allowed warning types
  -e|--errors <error_type>|list: Control errors or display the allowed error types
  -h|--help: 			 Print this help message and exit
  -V <variable[=value]>: 	 Set a variable
  -v|--version: 		 Print the version and exit
checking for x86_64-pc-linux-gnu-pkg-config... /usr/bin/pkg-config
checking pkg-config is at least version 0.16... yes

And, looking to build.log, I can see tutorial is not being built:

make -j5 -C docs/tutorial html 
make: Entering directory `/var/tmp/portage/dev-libs/gmime-2.4.31/work/gmime-2.4.31/docs/tutorial'
echo "***"
***
echo "*** Warning: Tutorial not built"
*** Warning: Tutorial not built
echo "***"
***
make: Leaving directory `/var/tmp/portage/dev-libs/gmime-2.4.31/work/gmime-2.4.31/docs/tutorial'


You will also see that, until now, we need to manually run:
make -C docs/tutorial html 

To get them build, otherwise are skipped, but this is an old problem :(

Created attachment 205037 [details]
config.log

Created attachment 205038 [details]
Full build.log

Created attachment 205686 [details] [review]
Proposed patch (for master branch)

(In reply to comment #4)

Right. DB2HTML is now a path to a tool, not just "true"/"false", so in AM_CONDITIONAL we need to test it for non-emptiness instead of trying to execute it.

Also, docbook2html uses . as the default output directory, while Fedora's db2html uses gmime-tut by default. Therefore, when calling $DB2HTML we need to explicitly specify the output directory ("-o html").

Created attachment 205687 [details] [review]
Proposed patch (for 2.4 branch)

Incidentally, if you want to test Fedora's db2html, you can find it at http://pkgs.fedoraproject.org/gitweb/?p=docbook-utils.git;a=blob;f=db2html

Applied in git, thanks!