DOCS_TARGET_REQUIRE_PROGRAM(INKSCAPE, inkscape, PEARSON)
DOCS_TARGET_REQUIRE_PROGRAM(INKSCAPE, inkscape, PLUCKER)
-DOCS_TARGET_REQUIRE_PROGRAM(EPSTOPDF, epstopdf, PDF)
DOCS_TARGET_REQUIRE_PROGRAM(PNGTOPNM, pngtopnm, PS)
DOCS_TARGET_REQUIRE_PROGRAM(PNMTOPS, pnmtops, PS)
DOCS_TARGET_REQUIRE_PROGRAM(DBLATEX, dblatex, LATEX)