ぱふぱふさん。レスありがとうございます。
残念ながら教えていただいたコマンドではdviファイル作成まで行けず、以下のような結果になりました。

This is pTeX, Version 3.14159-p3.1.3 (sjis) (Web2C 7.4.5)
(./ex2.tex
pLaTeX2e <2001/09/04>+0 (based on LaTeX2e <2001/06/01> patch level 0)
(/usr/local/share/texmf/ptex/platex/base/jarticle.cls
Document Class: jarticle 2001/10/04 v1.3 Standard pLaTeX class
(/usr/local/share/texmf/ptex/platex/base/jsize10.clo))
(/usr/local/share/texmf/ptex/platex/misc/emath/emathPp.sty
(/usr/local/share/texmf/ptex/platex/misc/emath/emathPh.sty
(/usr/local/share/texmf/ptex/platex/misc/emath/epic.sty
Enhancements to Picture Environment. Version 1.2 - Released June 1, 1986
) (/usr/local/share/texmf/ptex/platex/misc/emath/eepic.sty
Extension to Epic and LaTeX. Version 1.1e - Released Dec 21, 1999
) (/usr/local/share/texmf/ptex/platex/misc/emath/eclarith.sty
eclarith.sty 1.1 --- July 1, 1992
) (/usr/local/share/texmf/ptex/platex/misc/emath/emath.sty
(/usr/local/share/texmf/ptex/platex/misc/emath/emath2e.sty
(/usr/local/share/texmf/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
(/usr/local/share/texmf/tex/latex/amsmath/amstext.sty
(/usr/local/share/texmf/tex/latex/amsmath/amsgen.sty))
(/usr/local/share/texmf/tex/latex/amsmath/amsbsy.sty)
(/usr/local/share/texmf/tex/latex/amsmath/amsopn.sty))
(/usr/local/share/texmf/tex/latex/amsfonts/amssymb.sty
(/usr/local/share/texmf/tex/latex/amsfonts/amsfonts.sty))
(/usr/local/share/texmf/ptex/platex/misc/emath/emathC.sty
(/usr/local/share/texmf/tex/latex/tools/calc.sty))
(/usr/local/share/texmf/ptex/platex/misc/emath/emathE.sty

\calcval@tmp=

Perlとの連携ができていないようです。

▼関連発言
│
└◆3259:TeXShop＋ptexでemathのPerl連携 [nexus] 06/20 02:11
　├◆3261:Re:TeXShop＋ptexでemathのPerl連携 [ぱふぱふ] 06/20 10:06
　│└◆3271:Re[2]:TeXShop＋ptexでemathのPerl連携 [nexus] 06/21 00:23
　│　└◆3272:--- [---] 06/21 12:40
　└◆3273:Re:TeXShop＋ptexでemathのPerl連携 [genio] 06/21 12:46
　　└◆3274:Re[2]:TeXShop＋ptexでemathのPerl連携 [genio] 06/21 12:54<-last