We can query the compile options of Apache HTTPD and SuEXEC to check if present and if the binary exists:
$ httpd -V [...] Server compiled with.... [...] -D SUEXEC_BIN="/usr/local/sbin/suexec" [...] $ suexec -V -D AP_DOC_ROOT="/usr/local/www/data" -D AP_GID_MIN=1000 -D AP_HTTPD_USER="www" -D AP_LOG_EXEC="/var/log/httpd-suexec.log" -D AP_SAFE_PATH="/usr/local/bin:/usr/bin:/bin" -D AP_UID_MIN=1000 -D AP_USERDIR_SUFFIX="public_html" $ ls /usr/local/sbin/suexec # the value from SUEXEC_BIN compile option /usr/local/sbin/suexec