emathLb.sty97行目を
  \@ifpackageloaded{hyperref}{}{\ignorespaces}%
にして、2006年東大のプリアンブルに
\usepackage[dvipdfmx]{hyperref}
\usepackage{atbegshi}
\AtBeginShipoutFirst{\special{pdf:tounicode 90ms-RKSJ-UCS2}} %SJISの場合
\usepackage{emathLb}
を追加して、
\usepackage{graphicx,color}に[dvipdfmx]オプションを付けてコンパイルすると、
次のエラーになりました。hyperrefの内容で申し訳ありません。

%log---------------------------------------------------------------------------
This is pTeXk, Version 3.1415926-p3.1.10 (sjis) (Web2C 2009) (format=platex 2009.6.3)  8 JUN 2009 15:23
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**tokyo
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pLaTeX2e <2006/11/10>+0 (based on LaTeX2e <2005/12/01> patch level 0)
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Package: hyperref 2008/12/26 v6.78n Hypertext links for LaTeX

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Package: keyval 1999/03/16 v1.13 key=value parser (DPC)
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Package: xcolor-patch 2008/09/08 xcolor patch
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\@linkdim=\dimen122
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\Hy@pagecounter=\count92

(c:/usr/local/share/texmf/tex/latex/hyperref/pd1enc.def
File: pd1enc.def 2008/12/26 v6.78n Hyperref: PDFDocEncoding definition (HO)
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Package: etexcmds 2007/12/12 v1.2 Prefix for e-TeX command names (HO)

(c:/usr/local/share/texmf/tex/generic/oberdiek/infwarerr.sty
Package: infwarerr 2007/09/09 v1.2 Providing info/warning/message (HO)
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Package etexcmds Info: Could not find \unexpanded.
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(etexcmds)             In the latter case, load this package earlier.
Package etexcmds Info: Could not find \expanded.
(etexcmds)             That can mean that you are not using pdfTeX 1.50 or
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(etexcmds)             In the latter case, load this package earlier.
)
(c:/usr/local/share/texmf/tex/latex/config/hyperref.cfg
File: hyperref.cfg 
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Package: kvoptions 2007/10/18 v3.0 Keyval support for LaTeX options (HO)
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Package hyperref Info: Hyper figures OFF on input line 2907.
Package hyperref Info: Link nesting OFF on input line 2912.
Package hyperref Info: Hyper index ON on input line 2915.
Package hyperref Info: Plain pages OFF on input line 2922.
Package hyperref Info: Backreferencing OFF on input line 2927.

Implicit mode ON; LaTeX internals redefined
Package hyperref Info: Bookmarks ON on input line 3117.
(c:/usr/local/share/texmf/tex/latex/misc/url.sty
\Urlmuskip=\muskip10
Package: url 2004/03/15  ver 3.1  Verb mode for urls, etc.
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LaTeX Info: Redefining \url on input line 3354.

(c:/usr/local/share/texmf/tex/generic/oberdiek/bitset.sty
Package: bitset 2007/09/28 v1.0 Data type bit set (HO)

(c:/usr/local/share/texmf/tex/generic/oberdiek/intcalc.sty
Package: intcalc 2007/09/27 v1.1 Expandable integer calculations (HO)
)
(c:/usr/local/share/texmf/tex/generic/oberdiek/bigintcalc.sty
Package: bigintcalc 2007/11/11 v1.1 Expandable big integer calculations (HO)

(c:/usr/local/share/texmf/tex/generic/oberdiek/pdftexcmds.sty
Package: pdftexcmds 2007/12/12 v0.3 LuaTeX support for pdfTeX utility functions
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Package pdftexcmds Info: LuaTeX not detected on input line 139.
Package pdftexcmds Info: pdfTeX >= 1.30 not detected.
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Package hyperref Info: Hyper figures OFF on input line 4271.
Package hyperref Info: Link nesting OFF on input line 4276.
Package hyperref Info: Hyper index ON on input line 4279.
Package hyperref Info: backreferencing OFF on input line 4286.
Package hyperref Info: Link coloring OFF on input line 4291.
Package hyperref Info: Link coloring with OCG OFF on input line 4296.
Package hyperref Info: PDF/A mode OFF on input line 4301.

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*hyperref using driver hdvipdfm*
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Package: graphicx 1999/02/16 v1.0f Enhanced LaTeX Graphics (DPC,SPQR)

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Package: graphics 2006/02/20 v1.0o Standard LaTeX Graphics (DPC,SPQR)

(c:/usr/local/share/texmf/tex/latex/graphics/trig.sty
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(c:/musixtexmf/tex/platex/emath/emathPh.sty
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For additional information on amsmath, use the `?' option.
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Package: amstext 2000/06/29 v2.01

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LaTeX Info: Redefining \overline on input line 307.
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LaTeX Info: Redefining \ldots on input line 379.
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! LaTeX Error: Command \eqref already defined.
               Or name \end... illegal, see p.192 of the manual.

See the LaTeX manual or LaTeX Companion for explanation.
Type  H <return>  for immediate help.
 ...                                              
                                                  
l.898 ...{\eqref}[1]{\textup{\tagform@{\ref{#1}}}}
                                                  
?

▼関連発言
│
└◆8174:emathLb.sty[2008/03/09 v 0.11] [st] 06/07 22:42
　└◆8175:Re:emathLb.sty[2008/03/09 v 0.11] [tDB] 06/08 08:29
　　└◆8176:Re[2]:emathLb.sty[2008/03/09 v 0.11] [st] 06/08 15:30
　　　└◆8177:Re[3]:emathLb.sty[2008/03/09 v 0.11] [tDB] 06/08 16:08
　　　　└◆8178:Re[4]:emathLb.sty[2008/03/09 v 0.11] [st] 06/08 16:22
　　　　　└◆8179:Re[5]:emathLb.sty[2008/03/09 v 0.11] [tDB] 06/08 16:33
　　　　　　└◆8180:Re[6]:emathLb.sty[2008/03/09 v 0.11] [st] 06/08 16:43
　　　　　　　└◆8181:Re[7]:emathLb.sty[2008/03/09 v 0.11] [tDB] 06/08 17:00
　　　　　　　　└◆8183:Re[8]:emathLb.sty[2008/03/09 v 0.11] [st] 06/09 00:46
　　　　　　　　　└◆8184:Re[9]:emathLb.sty[2008/03/09 v 0.11] [tDB] 06/09 07:52
　　　　　　　　　　└◆8185:Re[10]:emathLb.sty[2008/03/09 v 0.11] [st] 06/09 14:51<-last