syslog-ng features manual pages for the Unix manual system in the doc/ subdirectory. However, these pages are not created when configuring, building and installing syslog-ng with CMake. The autotools config system creates a Makefile with a target manpages when calling configure with the option --enable-manpages. However, the autotools build is broken. The call of make manpages results in the following error

./configure: line 7001: syntax error near unexpected token `newline'
./configure: line 7001: `yes:'
make: *** [Makefile:13726: config.status] Error 2
Does anyone know how to create the manual pages in the current version?
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