Same reason as found in this commit to systemd:
commit 4ca39b280fce3c60d2fdecbd478fd9bf7f9d3e64
Author: Mike Gilbert <floppym@xxxxxxxxxx>
Date: Sun Feb 23 11:21:13 2014 -0500
configure: Do not require xsltproc for installation of man pages
The release tarballs ship with pre-generated man pages, so we do not
need xsltproc for a typical end-user build.
Developers will probably have xsltproc anyway, but if not they will now
encounter a build-time failure instead of an error in configure.
---
configure.ac | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/configure.ac b/configure.ac
index 4d9496e..54a52ea 100644
--- a/configure.ac
+++ b/configure.ac
@@ -36,6 +36,7 @@ AC_C_BIGENDIAN
AC_PROG_SED
AC_PROG_MKDIR_P
PKG_PROG_PKG_CONFIG
+AC_PATH_PROG([XSLTPROC], [xsltproc])
#####################################################################
@@ -111,10 +112,7 @@ AC_ARG_ENABLE([manpages],
AS_HELP_STRING([--disable-manpages], [disable manpages @<:@default=enabled@:>@]),
[], enable_manpages=yes)
AM_CONDITIONAL([BUILD_MANPAGES], [test "x$enable_manpages" = "xyes"])
-AC_PATH_PROG([XSLTPROC], [xsltproc], [no])
-AS_IF([test "x$XSLTPROC" = "xno" && test "x$enable_manpages" = "xyes"], [
- AC_MSG_ERROR([xsltproc command not found, try ./configure --disable-manpages])
-])
+AS_IF(["x$enable_manpages" != "xno"], ["have_manpages=yes"])
AC_ARG_ENABLE([logging],
AS_HELP_STRING([--disable-logging], [disable system logging @<:@default=enabled@:>@]),
--
1.9.0
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