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configure.in: Explain why to check for gzclearerr.

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Kalle Olavi Niemitalo 2008-02-17 18:44:48 +02:00 committed by Kalle Olavi Niemitalo
parent a7232792dd
commit ac03086754
1 changed files with 5 additions and 0 deletions
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configure.in
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@ -480,6 +480,11 @@ AC_DEFUN([EL_CONFIG_OPTIONAL_LIBRARY],
EL_CONFIG_OPTIONAL_LIBRARY(CONFIG_GPM, gpm, gpm.h, gpm, Gpm_Open,
[ --without-gpm disable gpm (mouse) support])
# ELinks calls deflateInit2 with windowBits = MAX_WBITS | 32, to
# enable automatic decoding of both zlib and gzip headers. This
# feature was added in zlib 1.2.0.2; earlier versions return an error.
# The gzclearerr function was also added in zlib 1.2.0.2, so check for
# that, even though ELinks does not actually call gzclearerr.
EL_CONFIG_OPTIONAL_LIBRARY(CONFIG_GZIP, zlib, zlib.h, z, gzclearerr,
[ --without-zlib disable zlib support])