[pacman-dev] configure syntax error even after issuing autogen.sh

Dear pacman developers, First time poster here, so please be gentle. I've been trying to compile pacman from git and I constantly run into an issue. First I issue ./autogen.sh and then ./configure but this error always pops up: ./configure: line 14968: syntax error near unexpected token `$file_version,' ./configure: line 14968: ` AX_COMPARE_VERSION($file_version, ge, 5.38, with_file_seccomp=yes)' What am I doing wrong?