From acf0b5e279d7a5154c32cac5e0ca820685bd01de Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Arsen=20Arsenovi=C4=87?= <arsen@aarsen.me>
Date: Sun, 27 Nov 2022 16:08:38 +0100
Subject: [PATCH] configure: Add --with s for automagic dependencies

---
Upstreamed after release, see
https://gitlab.com/nbdkit/nbdkit/-/merge_requests/18/pipelines

configure.ac | 109 +++++++++++++++++++++++++++++++++++----------------
 1 file changed, 76 insertions(+), 33 deletions(-)

diff --git a/configure.ac b/configure.ac
index c379edfb..5a64ed88 100644
--- a/configure.ac
+++ b/configure.ac
@@ -604,22 +604,40 @@ AC_MSG_RESULT([$is_glibc_234])
 AM_CONDITIONAL([HAVE_GLIBC_234], [test "x$is_glibc_234" = "xyes"])
 
 dnl Check for SELinux socket labelling (optional).
-PKG_CHECK_MODULES([LIBSELINUX], [libselinux], [
-    AC_SUBST([LIBSELINUX_CFLAGS])
-    AC_SUBST([LIBSELINUX_LIBS])
-    AC_DEFINE([HAVE_LIBSELINUX],[1],[libselinux found at compile time.])
-], [
-    AC_MSG_WARN([libselinux not found, SELinux socket labelling support will be disabled.])
+AC_ARG_WITH([selinux],
+    AS_HELP_STRING([--without-selinux], [disable SELinux support, used for socket labelling @<:@default=check@:>@]))
+AS_IF([test "x$with_selinux" != xno], [
+    PKG_CHECK_MODULES([LIBSELINUX], [libselinux], [
+        AC_SUBST([LIBSELINUX_CFLAGS])
+        AC_SUBST([LIBSELINUX_LIBS])
+        AC_DEFINE([HAVE_LIBSELINUX],[1],[libselinux found at compile time.])
+    ], [AC_MSG_WARN([libselinux not found, sockets will not be labeled.])])
+])
+
+AS_IF([test "x$with_selinux" = xyes && test "x$LIBSELINUX_LIBS" = x], [
+    AC_MSG_ERROR([selinux requested but not found])
 ])
 
 dnl Check for GnuTLS (optional, for TLS support).
-PKG_CHECK_MODULES([GNUTLS], [gnutls >= 3.3.0], [
-    AC_SUBST([GNUTLS_CFLAGS])
-    AC_SUBST([GNUTLS_LIBS])
-    AC_DEFINE([HAVE_GNUTLS],[1],[gnutls found at compile time.])
-], [
-    AC_MSG_WARN([gnutls not found or < 3.3.0, TLS support will be disabled.])
+AC_ARG_WITH([gnutls],
+    [AS_HELP_STRING([--without-gnutls], [disable TLS support via GnuTLS @<:@default=check@:>@])],
+    [],
+    [: m4_divert_text([DEFAULTS], [with_manpages=check])])
+
+AS_IF([test "x$with_gnutls" != xno], [
+    PKG_CHECK_MODULES([GNUTLS], [gnutls >= 3.3.0], [
+        AC_SUBST([GNUTLS_CFLAGS])
+        AC_SUBST([GNUTLS_LIBS])
+        AC_DEFINE([HAVE_GNUTLS],[1],[gnutls found at compile time.])
+    ], [
+        AC_MSG_WARN([gnutls not found or < 3.3.0, TLS support will be disabled.])
+    ])
 ])
+
+AS_IF([test "x$with_gnutls" = xyes && test x"$GNUTLS_LIBS" = x], [
+    AC_MSG_ERROR([gnutls requested but not found])
+])
+
 AM_CONDITIONAL([HAVE_GNUTLS], [test "x$GNUTLS_LIBS" != "x"])
 
 AS_IF([test "x$GNUTLS_LIBS" != "x"],[
@@ -733,34 +751,59 @@ AM_CONDITIONAL([USE_LINKER_SCRIPT],
                [test "x$use_linker_script" = "xyes"])
 
 dnl Bash completion.
-PKG_CHECK_MODULES([BASH_COMPLETION], [bash-completion >= 2.0], [
-    bash_completion=yes
-    AC_MSG_CHECKING([for bash-completions directory])
-    m4_ifdef([PKG_CHECK_VAR],[
-        PKG_CHECK_VAR(bashcompdir, [bash-completion], [completionsdir])
+AC_ARG_WITH([bash-completions],
+    [AS_HELP_STRING([--without-bash-completions], [disable installing bash completions @<:@default=check@:>@])],
+    [],
+    [: m4_divert_text([DEFAULTS], [with_readline=check])])
+
+AS_IF([test "x$with_bash_completions" != xno], [
+    PKG_CHECK_MODULES([BASH_COMPLETION], [bash-completion >= 2.0], [
+        bash_completion=yes
+        AC_MSG_CHECKING([for bash-completions directory])
+        m4_ifdef([PKG_CHECK_VAR],[
+            PKG_CHECK_VAR(bashcompdir, [bash-completion], [completionsdir])
+        ])
+        AS_IF([test -z "$bashcompdir"], [
+            bashcompdir="${sysconfdir}/bash_completion.d"
+        ])
+        AC_MSG_RESULT([$bashcompdir])
+        AC_SUBST([bashcompdir])
+    ],[
+        bash_completion=no
+        AC_MSG_WARN([bash-completion not installed])
     ])
-    AS_IF([test -z "$bashcompdir"], [
-        bashcompdir="${sysconfdir}/bash_completion.d"
-    ])
-    AC_MSG_RESULT([$bashcompdir])
-    AC_SUBST([bashcompdir])
-],[
-    bash_completion=no
-    AC_MSG_WARN([bash-completion not installed])
 ])
+
+AS_IF([test "x$bash_completion" = xno && test "x$with_bash_completions" = xyes], [
+    AC_MSG_ERROR([bash-completions requested but required packages not found])
+])
+
 AM_CONDITIONAL([HAVE_BASH_COMPLETION],[test "x$bash_completion" = "xyes"])
 
 dnl Check we have enough to run podwrapper.
-AC_CHECK_PROG([PERL],[perl],[perl],[no])
-AS_IF([test "x$PERL" != "xno"],[
-    AC_MSG_CHECKING([if we have perl Pod::Man and Pod::Simple])
-    AS_IF([$PERL -MPod::Man -MPod::Simple -e 1 >&AS_MESSAGE_LOG_FD 2>&1],[
-        enable_pod=yes
-    ],[
-        enable_pod=no
+
+AC_ARG_WITH([manpages],
+    [AS_HELP_STRING([--without-manpages], [Do not build man pages @<:@default=check@:>@])],
+    [],
+    [: m4_divert_text([DEFAULTS], [with_manpages=check])])
+
+enable_pod=no
+AC_CHECK_PROGS([PERL], [perl], [])
+
+AS_IF([test "x$enable_manpages" != xno], [
+    AS_IF([test "x$PERL" != "x"],[
+        AC_MSG_CHECKING([if we have perl Pod::Man and Pod::Simple])
+        AS_IF([$PERL -MPod::Man -MPod::Simple -e 1 >&AS_MESSAGE_LOG_FD 2>&1],[
+            enable_pod=yes
+        ])
+        AC_MSG_RESULT([$enable_pod])
     ])
-    AC_MSG_RESULT([$enable_pod])
 ])
+
+AS_IF([test "x$enable_pod" = xno && test "x$enable_manpages" = xyes], [
+    AC_MSG_ERROR([man-pages requested but required packages not found])
+])
+
 AM_CONDITIONAL([HAVE_POD],
                [test "x$PERL" != "xno" && test "x$enable_pod" = "xyes"])
 
-- 
2.38.1