Checking for freetype2 configure error when installing PHP 5.6.37 from AUR

I'm trying to install PHP version 5.6.37 from AUR using makepkg -i command, but when it reaches the moment to check for the "freetype2" it displays the error: > checking for freetype2... configure: error: freetype-config not found. I already have 7.2 installed, but I need the 5.6 for an older project, and as in Ubuntu, I intend to have both installed. makepkg -i ==> Making package: php56 5.6.37-1 (Wed 12 Sep 2018 12:27:39 PM +08) ==> Checking runtime dependencies... ==> Checking buildtime dependencies... ==> Retrieving sources... -> Found php-5.6.37.tar.xz -> Found php-5.6.37.tar.xz.asc -> Found php.ini.patch -> Found apache.conf -> Found php-fpm.conf.in.patch -> Found logrotate.d.php-fpm -> Found php-fpm.service -> Found php-fpm.tmpfiles -> Found use-enchant2.patch -> Found php-freetype-2.9.1.patch ==> Validating source files with sha512sums... [...] checking whether to enable truetype string function in GD... yes checking whether to enable JIS-mapped Japanese font support in GD... no If configure fails try --with-vpx-dir= checking for jpeg_read_header in -ljpeg... yes checking for png_write_image in -lpng... yes checking for XpmFreeXpmImage in -lXpm... yes checking for pkg-config... (cached) no checking for freetype2... configure: error: freetype-config not found. ==> ERROR: A failure occurred in build(). Aborting... Installing freetype2 with Pacman didn't solve it.