diff --git a/build/php.m4 b/build/php.m4
index 6efd3bc8848..e4b7b09f90d 100644
--- a/build/php.m4
+++ b/build/php.m4
@@ -1828,10 +1828,10 @@ AC_DEFUN([PHP_SETUP_ICONV], [
     dnl Reset LIBS temporarily as it may have already been included -liconv in.
     LIBS_save="$LIBS"
     LIBS=
-    AC_CHECK_FUNC(iconv, [
+    AC_CHECK_FUNC([iconv], [
       found_iconv=yes
     ],[
-      AC_CHECK_FUNC(libiconv,[
+      AC_CHECK_FUNC([libiconv], [
         AC_DEFINE(HAVE_LIBICONV, 1, [ ])
         found_iconv=yes
       ])
diff --git a/configure.ac b/configure.ac
index 7b6da82e009..8deff664ef8 100644
--- a/configure.ac
+++ b/configure.ac
@@ -582,67 +582,67 @@ AC_CACHE_CHECK([for IPv6 support], ac_cv_ipv6_support,
 dnl Checks for library functions.
 dnl ----------------------------------------------------------------------------
 
-AC_CHECK_FUNCS(
-alphasort \
-asctime_r \
-chroot \
-ctime_r \
-explicit_memset \
-fdatasync \
-flock \
-ftok \
-funopen \
-gai_strerror \
-getcwd \
-gethostname \
-getloadavg \
-getlogin \
-getprotobyname \
-getprotobynumber \
-getservbyname \
-getservbyport \
-getrusage \
-gettimeofday \
-gmtime_r \
-getpwnam_r \
-getgrnam_r \
-getpwuid_r \
-getwd \
-glob \
-localtime_r \
-lchown \
-memcntl \
-memfd_create \
-mkstemp \
-mmap \
-nice \
-nl_langinfo \
-poll \
-pthread_jit_write_protect_np \
-putenv \
-scandir \
-setitimer \
-setenv \
-shutdown \
-sigprocmask \
-statfs \
-statvfs \
-std_syslog \
-strcasecmp \
-strnlen \
-strptime \
-strtok_r \
-symlink \
-tzset \
-unsetenv \
-usleep \
-utime \
-vasprintf \
-asprintf \
-memmem \
-memrchr \
-mempcpy \
-)
+AC_CHECK_FUNCS(m4_normalize([
+  alphasort
+  asctime_r
+  asprintf
+  chroot
+  ctime_r
+  explicit_memset
+  fdatasync
+  flock
+  ftok
+  funopen
+  gai_strerror
+  getcwd
+  getgrnam_r
+  gethostname
+  getloadavg
+  getlogin
+  getprotobyname
+  getprotobynumber
+  getpwnam_r
+  getpwuid_r
+  getrusage
+  getservbyname
+  getservbyport
+  gettimeofday
+  getwd
+  glob
+  gmtime_r
+  lchown
+  localtime_r
+  memcntl
+  memfd_create
+  memmem
+  mempcpy
+  memrchr
+  mkstemp
+  mmap
+  nice
+  nl_langinfo
+  poll
+  pthread_jit_write_protect_np
+  putenv
+  scandir
+  setenv
+  setitimer
+  shutdown
+  sigprocmask
+  statfs
+  statvfs
+  std_syslog
+  strcasecmp
+  strnlen
+  strptime
+  strtok_r
+  symlink
+  tzset
+  unsetenv
+  usleep
+  utime
+  vasprintf
+]))
 
 AC_CHECK_FUNC([inet_ntop],,[AC_MSG_ERROR([Required inet_ntop not found.])])
 AC_CHECK_FUNC([inet_pton],,[AC_MSG_ERROR([Required inet_pton not found.])])
diff --git a/ext/date/config0.m4 b/ext/date/config0.m4
index 6b803bf33e5..5225399cb4d 100644
--- a/ext/date/config0.m4
+++ b/ext/date/config0.m4
@@ -2,7 +2,7 @@ dnl Check for headers needed by timelib
 AC_CHECK_HEADERS([io.h])
 
 dnl Check for strtoll, atoll
-AC_CHECK_FUNCS(strtoll atoll)
+AC_CHECK_FUNCS([strtoll atoll])
 
 PHP_DATE_CFLAGS="-Wno-implicit-fallthrough -I@ext_builddir@/lib -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1 -DHAVE_TIMELIB_CONFIG_H=1"
 timelib_sources="lib/astro.c lib/dow.c lib/parse_date.c lib/parse_tz.c lib/parse_posix.c
diff --git a/ext/ldap/config.m4 b/ext/ldap/config.m4
index 76c097a17b8..18178c8cf77 100644
--- a/ext/ldap/config.m4
+++ b/ext/ldap/config.m4
@@ -111,7 +111,18 @@ if test "$PHP_LDAP" != "no"; then
 
   dnl Solaris 2.8 claims to be 2004 API, but doesn't have ldap_parse_reference()
   dnl nor ldap_start_tls_s()
-  AC_CHECK_FUNCS([ldap_parse_result ldap_parse_reference ldap_start_tls_s ldap_control_find ldap_parse_extended_result ldap_extended_operation ldap_extended_operation_s ldap_passwd ldap_whoami_s ldap_refresh_s])
+  AC_CHECK_FUNCS(m4_normalize([
+    ldap_control_find
+    ldap_extended_operation
+    ldap_extended_operation_s
+    ldap_parse_extended_result
+    ldap_parse_reference
+    ldap_parse_result
+    ldap_passwd
+    ldap_refresh_s
+    ldap_start_tls_s
+    ldap_whoami_s
+  ]))
 
   dnl SASL check
   if test "$PHP_LDAP_SASL" != "no"; then
diff --git a/ext/posix/config.m4 b/ext/posix/config.m4
index e6bda42e590..d9613452148 100644
--- a/ext/posix/config.m4
+++ b/ext/posix/config.m4
@@ -8,7 +8,22 @@ if test "$PHP_POSIX" = "yes"; then
   AC_DEFINE(HAVE_POSIX, 1, [whether to include POSIX-like functions])
   PHP_NEW_EXTENSION(posix, posix.c, $ext_shared,, -DZEND_ENABLE_STATIC_TSRMLS_CACHE=1)
 
-  AC_CHECK_FUNCS(seteuid setegid setsid getsid getpgid ctermid mkfifo mknod setrlimit getrlimit getgroups initgroups getgrgid_r eaccess)
+  AC_CHECK_FUNCS(m4_normalize([
+    ctermid
+    eaccess
+    getgrgid_r
+    getgroups
+    getpgid
+    getrlimit
+    getsid
+    initgroups
+    mkfifo
+    mknod
+    setegid
+    seteuid
+    setrlimit
+    setsid
+  ]))
 
   dnl Check for makedev. If it's defined as a macro, AC_CHECK_FUNCS won't work.
   dnl Required headers are included by the AC_HEADER_MAJOR logic.
@@ -25,7 +40,7 @@ if test "$PHP_POSIX" = "yes"; then
 dnl Skip pathconf and fpathconf check on musl libc due to limited implementation
 dnl (first argument is not validated and has different error).
   AS_IF([command -v ldd >/dev/null && ldd --version 2>&1 | grep -q "^musl"],[],
-    [AC_CHECK_FUNCS(pathconf fpathconf)])
+    [AC_CHECK_FUNCS([pathconf fpathconf])])
 
   AC_CACHE_CHECK([for working ttyname_r() implementation],
     [php_cv_func_ttyname_r],
diff --git a/ext/standard/config.m4 b/ext/standard/config.m4
index 0a5bc30c0c9..02d939f051e 100644
--- a/ext/standard/config.m4
+++ b/ext/standard/config.m4
@@ -283,7 +283,7 @@ dnl
 dnl Check if there is a support means of creating a new process and defining
 dnl which handles it receives
 dnl
-AC_CHECK_FUNCS(fork CreateProcess, [
+AC_CHECK_FUNCS([fork CreateProcess], [
   php_can_support_proc_open=yes
   break
 ],[
diff --git a/sapi/cli/config.m4 b/sapi/cli/config.m4
index 3e58a9aeb74..b6a708c0e96 100644
--- a/sapi/cli/config.m4
+++ b/sapi/cli/config.m4
@@ -4,7 +4,7 @@ PHP_ARG_ENABLE([cli],,
   [yes],
   [no])
 
-AC_CHECK_FUNCS(setproctitle)
+AC_CHECK_FUNCS([setproctitle])
 
 AC_CHECK_HEADERS([sys/pstat.h])