gl_ABSOLUTE_HEADER doesn't work for me

[LRN]

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These two lines:
      gl_cv_absolute_stdint_h=`(eval "$ac_cpp conftest.$ac_ext") 2>&5 |
sed -n '\#/stdint.h#{s#.*"\(.*/stdint.h\)".*#\1#;s#^/[^/]#//&#;p;q;}'`

produce an empty string.
I assume the part of the macro that is responsible for generating this
shell code is:
      AS_VAR_SET(gl_absolute_header,
[`(eval "$ac_cpp conftest.$ac_ext") 2>&AS_MESSAGE_LOG_FD |
sed -n
'\#/]m4_quote(m4_defn([gl_HEADER_NAME]))[#{s#.*"\(.*/]m4_quote(m4_defn([gl_HEADER_NAME]))[\)".*#\1#;s#^/[^/]#//&#;p;q;}'`])


I'm not a sed guru, so i need help debugging this.

The output of eval "$ac_cpp conftest.$ac_ext" is attached.

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iQEcBAEBAgAGBQJRsHBBAAoJEOs4Jb6SI2CwDEQH/jVwyWRWHcWm1BjmnsMApSVQ
TnjE6mb/Z1L3po4TFaP/DUnV/nKgJBoRnbGv6YFbE6fSNWtHZgn0flzoYvy/SusT
tErCKIG3R65UUIJC/4/pDHLrl1yNQnCfS2bwrldoM9w1P/sgThaGdQtpoYTvDzIz
lw3JF8Lk7XB18+ZS7XyB5YfmvViXogmDUap8P7KEuXSuol+N9IU5tOeBqaGlbWi1
Sx83s8ynPFvSd7yCf5Xeks8+rFfjIKDfvMGvOLnd+gvISLdMpuXk9k2fPrOgYcNR
I0NeVfGn7Rrc8YlpUGR2QNL/b94TBmQETd//6NO+UOH73CQte8Mb7Akbutty2Q4=
=A+yE
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checkstdint.out
Description: Text document