Included below is a patch to add pdflatex compatibility to the pslatex 
term when the auxfile option is selected. Without the patch, the
output of this term is incompatible with pdflatex because of the use
of postscript specials and the mechanism used to include the
postscript graphics file. The patch modifies the terminal in auxfile
mode so that postscript specials aren't used, and the graphics file is 
included using a mechanism which works for postscript and pdf (ps2pdf 
should be used to generate the pdf version of the postscript graphics
file). Including the following before \begin{document} allows
latex and pdflatex to be run on the same latex source file when
including pslatex (with auxfile option) outputs from the patched
gnuplot:

\newif\ifpdf
\ifx\pdfoutput\undefined
  \pdffalse
\else
  \pdfoutput=1
  \pdftrue
\fi

\ifpdf
  \usepackage{graphicx}
  \DeclareGraphicsExtensions{.pdf}
  \pdfcompresslevel=9
\else
  \usepackage{graphicx}
  \DeclareGraphicsExtensions{.pstex,.ps,.eps}
\fi



Notes:	      The patched version hasn't been tested very extensively,
	      (all testing under RedHat 6.1 Linux) but seems to do the 
	      trick. Some of the changes could probably improved upon
	      - this is intended as an initial version to stimulate
	      further development. The #define of PDFLATEX_COMPAT
	      should probably be moved to the central configuration
	      mechanism.

Instructions: Copy the patch file into the term directory of the
	      gnuplot 3.7.1 build and then run
	     
	        patch < patchfilename

	      before rebuilding.


*** pslatex.trm.orig	Wed May  3 13:59:50 2000
--- pslatex.trm	Wed May  3 13:59:50 2000
***************
*** 51,56 ****
--- 51,58 ----
  
  #include "driver.h"
  
+ #define PDFLATEX_COMPAT 1
+ 
  #ifdef TERM_REGISTER
  register_term(pslatex)
  register_term(pstex)
***************
*** 309,317 ****
--- 311,321 ----
  	}
  
  	/* generate special which xdvi and dvips can handle */
+ #ifndef PDFLATEX_COMPAT
  	fprintf(gpoutfile,
  		"\\special{psfile=%s llx=0 lly=0 urx=%d ury=%d rwi=%d}\n",
  		psfile_basename, urx, ury, 10 * urx);
+ #endif
  	tmp = gpoutfile;
  	gpoutfile = PSLATEX_auxFile;
  	PS_graphics();
***************
*** 417,425 ****
--- 421,433 ----
  		break;
  	    case 1:		/* put text in a short stack */
  		if (PSLATEX_rotate) {
+ #ifdef PDFLATEX_COMPAT
+ 		  fputs("%\n\\rotatebox{90}{%\n", gpoutfile);
+ #else
  		    fputs("\
  %\n\\special{ps: gsave currentpoint currentpoint translate\n\
  270 rotate neg exch neg exch translate}%\n", gpoutfile);
+ #endif
  		}
  		switch (tc->justify) {
  		case LEFT:
***************
*** 442,448 ****
--- 450,460 ----
  		    break;
  		}
  		if (PSLATEX_rotate) {
+ #ifdef PDFLATEX_COMPAT
+ 		  fputs("%\n}%\n", gpoutfile);
+ #else
  		    fputs("%\n\\special{ps: currentpoint grestore moveto}%\n", gpoutfile);
+ #endif
  		}
  	    }
  	fputs("}%\n", gpoutfile);
***************
*** 456,461 ****
--- 468,485 ----
      }
  
      if (PSLATEX_output) {
+ #ifdef PDFLATEX_COMPAT
+       if (PSLATEX_auxFile) {
+ 	char *filename_noext = 0, *dotpos = 0;
+ 	filename_noext = malloc(strlen(PSLATEX_psfile)+1);
+ 	strcpy(filename_noext, PSLATEX_psfile);
+ 	dotpos = strrchr(filename_noext, '.');
+ 	if (dotpos)
+ 	  *dotpos = '\0';
+ 	fprintf(gpoutfile, "\\includegraphics{%s}%\n",filename_noext);
+ 	free(filename_noext);
+       }
+ #endif
  	fputs("\
  \\end{picture}%\n\
  \\endgroup\n\