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diff -up asymptote-1.91/configure.ac.BAD asymptote-1.91/configure.ac
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--- asymptote-1.91/configure.ac.BAD	2010-02-19 13:53:39.000474697 -0500
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+++ asymptote-1.91/configure.ac	2010-02-19 13:54:06.820617338 -0500
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@@ -217,6 +217,7 @@ AC_MSG_ERROR([*** Please install libz on
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 AC_CHECK_LIB([pthread], [pthread_create])
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 AC_CHECK_LIB([sigsegv], [stackoverflow_install_handler])
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 AC_CHECK_LIB([rt], [sched_yield])
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+AC_CHECK_LIB([GL], [glDepthMask])
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 AC_ARG_ENABLE(readline,
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 [AS_HELP_STRING(--enable-readline[[[=yes]]],enable GNU Readline Library)])