gcc failed on x86_64 dockyard-devel (c64.arklinux.org)

gcc failed to build on x86_64 for dockyard-devel.
Last 250 lines of build log:

Installing gcc-4.3.0-0.128667.1ark.src.rpm
Building target platforms: x86_64
Building for target x86_64
Executing(%prep): /bin/sh -e /var/tmp/rpm-tmp.20892
+ umask 022
+ cd /build-gcc-x86_64/BUILD
+ cd /build-gcc-x86_64/BUILD
+ rm -rf gcc-4.3.0
+ tar -xf /usr/src/ark/SOURCES/gcc-4.3.0-128667.tar.lz
+ cd gcc-4.3.0
++ /usr/bin/id -u
+ '[' 0 = 0 ']'
+ /bin/chown -Rhf root .
++ /usr/bin/id -u
+ '[' 0 = 0 ']'
+ /bin/chgrp -Rhf root .
+ /bin/chmod -Rf a+rX,g-w,o-w .
+ cp /usr/src/ark/SOURCES/ecj-latest.jar ecj.jar
+ echo 'Patch #12 (gcc41-java-nomulti.patch):'
Patch #12 (gcc41-java-nomulti.patch):
+ patch -p0 -b --suffix .nomultilibpeers~ -s
+ cd libjava/classpath
+ autoconf
/var/tmp/rpm-tmp.20892: line 46: autoconf: command not found
error: Bad exit status from /var/tmp/rpm-tmp.20892 (%prep)


RPM build errors:
    Bad exit status from /var/tmp/rpm-tmp.20892 (%prep)