Do not require picins.sty.

https://bugs.gentoo.org/577828#c4

--- gnuplot-5.0.6-orig/docs/Makefile.am

+++ gnuplot-5.0.6/docs/Makefile.am

@@ -189,7 +189,6 @@

 	  touch figures.idx ; \

 	  rm -f pdffigures.tex ; \

 	  ( echo "\usepackage{graphicx}" > pdffigures.tex ; \

-	    echo "\usepackage{picins}" >> pdffigures.tex ; \

 	  ) ; \

 	  TEXINPUTS=.:$(srcdir):$(top_srcdir):${TEXINPUTS}: $(PDFLATEX) $< ; \

 	  TEXINPUTS=.:$(srcdir):$(top_srcdir):${TEXINPUTS}: $(PDFLATEX) $< ; \

--- gnuplot-5.0.6-orig/docs/doc2tex.c

+++ gnuplot-5.0.6/docs/doc2tex.c

@@ -170,9 +170,9 @@

     case 'F':			/* embedded figure */

 	    if (figures) {

 		line[strlen(line)-1]=NUL;

-		(void) fputs("\\parpic[r][rt]{\\includegraphics[width=3in,keepaspectratio]{",b);

+		(void) fputs("\\begin{figure}[htb]\n\\centering\\includegraphics[width=3in,keepaspectratio]{",b);

 		fputs(line+1, b);

-		(void) fputs("}}\n",b);

+		(void) fputs("}\n\\end{figure}\n",b);

 	    }

 	    break;