sed-4.1.5 build failure on MaxOS X

[Bruno Haible]

Hi,

sed 4.1.5 fails to build on MacOS X 10.3.9:

$ ./configure --prefix=/Volumes/UserData/local-macos --program-prefix=gnu-
...
configure: creating ./config.status
config.status: creating bootstrap.sh
config.status: creating Makefile
config.status: creating doc/Makefile
config.status: creating lib/Makefile
config.status: creating sed/Makefile
config.status: creating testsuite/Makefile
config.status: creating po/Makefile.in
config.status: creating intl/Makefile
config.status: creating config.h
config.status: linking ./lib/regex_.h to lib/regex.h
config.status: executing depfiles commands
config.status: executing default-1 commands
config.status: creating po/POTFILES
config.status: creating po/Makefile
config.status: executing gettext-fix commands
sed: 1: "install_sh=/Users/bruno ...": command i expects \ followed by text
sed: 1: "install_sh=/Users/bruno ...": command i expects \ followed by text

The reason is this piece of configure.ac:

  sed -e '/^mkinstalldirs *=/a\' \
      -e "install_sh=$install_sh" \

Only with GNU sed you can split a sed command into multiple -e option, one
per line. According to POSIX, you should use a multiline argument:

  sed -e "/^mkinstalldirs *=/a\\
install_sh=$install_sh"

Bruno