Created attachment 1018607 [details]
Patch for file /usr/share/texlive/texmf-dist/tex/plain/etex/etex.src

Description of problem:

pdfcrop fails in Fedora 21 with the following error message (the relevant part of the message):

###############################################################################
! Missing number, treated as zero.
<to be read again> 
                   \chardef 
<to be read again> 
                   \rhm@arabic 
\addlanguage ...\chardef \csname rhm@#1\endcsname 
                                                  =#5 \uselanguage {#1}\inpu...
l.62 \addlanguage{arabic}{zerohyph.tex}{}{}{}
                                             
? 
! Emergency stop.
<to be read again> 
                   \chardef 
<to be read again> 
                   \rhm@arabic 
\addlanguage ...\chardef \csname rhm@#1\endcsname 
                                                  =#5 \uselanguage {#1}\inpu...
l.62 \addlanguage{arabic}{zerohyph.tex}{}{}{}
                                             
!  ==> Fatal error occurred, no output PDF file produced!
###############################################################################


I have checked the files and found that pdfcrop calls etex, and that reads the file
/usr/share/texlive/texmf-dist/tex/generic/config/language.def
which contains the line

\addlanguage{arabic}{zerohyph.tex}{}{}{}

\addlanguage is defined in file
/usr/share/texlive/texmf-dist/tex/plain/etex/etex.src

The macro crashes when called with empty parameters #4 or #5,
because \chardef= needs a numeric value.


I modified this file to use a default value when parameters #4 or #5 are empty.
I have chosen the value "1" as default value ; I am not sure if this is right.
But pdfcrop works again with this modification.



Version-Release number of selected component (if applicable):
texlive-pdfcrop-bin-svn14387.0-3.1.20140525_r34255.fc21.noarch
texlive-hyphen-base-svn31131.0-3.1.fc21.noarch
texlive-etex-svn31600.2.1-3.1.fc21.noarch

How reproducible:
Always

Steps to Reproduce:
1. Install package texlive-pdfcrop .
2. Find a pdf file as test file, or create a new one with the following commands:
  cat > pdfcrop-test.tex <<EOF
\documentclass[a4paper]{article}
\usepackage[T1]{fontenc}
\usepackage[utf8]{inputenc}
\begin{document}
This ist a little text.
\end{document}
EOF

  pfdlatex pdfcrop-test.pdf

3. Run pdfcrop with the pdf file, for example
  pdfcrop pdfcrop-test.pdf pdfcrop-test-crop.pdf


Actual results:
Error, no file created.

Expected results:
No error.