devel/subversion: can not update, CLANG error (subversion 1.7.3 -> 1.7.4)

[O. Hartmann]

Hello,
I faced this error this morning when trying to update/upgrade port
devel/subversion 1.7.3 to 1.7.4:

clang: warning: argument unused during compilation: '-fpic'
clang: warning: argument unused during compilation: '-fpic'
subversion/libsvn_client/cat.c:164:15: error: implicit declaration of
function 'svn_subst_build_keywords3' is invalid in C99
[-Werror,-Wimplicit-function-declaration]
      SVN_ERR(svn_subst_build_keywords3(&kw, keywords->data, rev_str, url,
              ^
./subversion/include/svn_error.h:303:35: note: expanded from:
    svn_error_t *svn_err__temp = (expr);        \
                                  ^
subversion/libsvn_client/cat.c:164:7: warning: incompatible integer to
pointer conversion initializing 'svn_error_t *' (aka 'struct svn_error_t
*') with an expression of type 'int';
      SVN_ERR(svn_subst_build_keywords3(&kw, keywords->data, rev_str, url,
      ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./subversion/include/svn_error.h:303:18: note: expanded from:
    svn_error_t *svn_err__temp = (expr);        \
                 ^               ~~~~~~
/usr/local/bin/libtool --tag=CC --silent --mode=compile clang  -O2 -pipe
-O2 -fno-strict-aliasing -pipe -O3 -pipe -fno-strict-aliasing
-march=native -fpic -DPIC  -g -O2  -Werror=implicit-function-declaration
 -I./subversion/include -I./subversion  -I/usr/local/include/apr-1
-I/usr/local/include/apr-1 -I/usr/local/include -I/usr/include
-I/usr/local/include/db5   -I/usr/local/include/dbus-1.0
-I/usr/local/include/dbus-1.0/include   -I/usr/local/include/glib-2.0
-I/usr/local/include/gnome-keyring-1     -I/usr/local/include/neon
-I/usr/local/include -I/usr/local/include/serf-1 -I/usr/local/include
-I/usr/local/include  -o subversion/libsvn_client/cmdline.lo -c
subversion/libsvn_client/cmdline.c
/usr/local/bin/libtool --tag=CC --silent --mode=compile clang  -O2 -pipe
-O2 -fno-strict-aliasing -pipe -O3 -pipe -fno-strict-aliasing
-march=native -fpic -DPIC  -g -O2  -Werror=implicit-function-declaration
 -I./subversion/include -I./subversion  -I/usr/local/include/apr-1
-I/usr/local/include/apr-1 -I/usr/local/include -I/usr/include
-I/usr/local/include/db5   -I/usr/local/include/dbus-1.0
-I/usr/local/include/dbus-1.0/include   -I/usr/local/include/glib-2.0
-I/usr/local/include/gnome-keyring-1     -I/usr/local/include/neon
-I/usr/local/include -I/usr/local/include/serf-1 -I/usr/local/include
-I/usr/local/include  -o subversion/libsvn_client/commit.lo -c
subversion/libsvn_client/commit.c
/usr/local/bin/libtool --tag=CC --silent --mode=compile clang  -O2 -pipe
-O2 -fno-strict-aliasing -pipe -O3 -pipe -fno-strict-aliasing
-march=native -fpic -DPIC  -g -O2  -Werror=implicit-function-declaration
 -I./subversion/include -I./subversion  -I/usr/local/include/apr-1
-I/usr/local/include/apr-1 -I/usr/local/include -I/usr/include
-I/usr/local/include/db5   -I/usr/local/include/dbus-1.0
-I/usr/local/include/dbus-1.0/include   -I/usr/local/include/glib-2.0
-I/usr/local/include/gnome-keyring-1     -I/usr/local/include/neon
-I/usr/local/include -I/usr/local/include/serf-1 -I/usr/local/include
-I/usr/local/include  -o subversion/libsvn_client/commit_util.lo -c
subversion/libsvn_client/commit_util.c
/usr/local/bin/libtool --tag=CC --silent --mode=compile clang  -O2 -pipe
-O2 -fno-strict-aliasing -pipe -O3 -pipe -fno-strict-aliasing
-march=native -fpic -DPIC  -g -O2  -Werror=implicit-function-declaration
 -I./subversion/include -I./subversion  -I/usr/local/include/apr-1
-I/usr/local/include/apr-1 -I/usr/local/include -I/usr/include
-I/usr/local/include/db5   -I/usr/local/include/dbus-1.0
-I/usr/local/include/dbus-1.0/include   -I/usr/local/include/glib-2.0
-I/usr/local/include/gnome-keyring-1     -I/usr/local/include/neon
-I/usr/local/include -I/usr/local/include/serf-1 -I/usr/local/include
-I/usr/local/include  -o subversion/libsvn_client/compat_providers.lo -c
subversion/libsvn_client/compat_providers.c
subversion/libsvn_client/cat.c:290:11: warning: incompatible integer to
pointer conversion initializing 'svn_error_t *' (aka 'struct svn_error_t
*') with an expression of type 'int';
          SVN_ERR(svn_subst_build_keywords3
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./subversion/include/svn_error.h:303:18: note: expanded from:
    svn_error_t *svn_err__temp = (expr);        \
                 ^               ~~~~~~
2 warnings and 1 error generated.
*** [subversion/libsvn_client/cat.lo] Error code 1
clang: warning: argument unused during compilation: '-fpic'
clang: warning: argument unused during compilation: '-fpic'
clang: warning: argument unused during compilation: '-fpic'
clang: warning: argument unused during compilation: '-fpic'
clang: warning: argument unused during compilation: '-fpic'
subversion/libsvn_client/commit.c:129:13: error: implicit declaration of
function 'svn_subst_build_keywords3' is invalid in C99
[-Werror,-Wimplicit-function-declaration]
    SVN_ERR(svn_subst_build_keywords3(&keywords, keywords_val->data,
            ^
./subversion/include/svn_error.h:303:35: note: expanded from:
    svn_error_t *svn_err__temp = (expr);        \
                                  ^
subversion/libsvn_client/commit.c:129:5: warning: incompatible integer
to pointer conversion initializing 'svn_error_t *' (aka 'struct
svn_error_t *') with an expression of type 'int';
    SVN_ERR(svn_subst_build_keywords3(&keywords, keywords_val->data,
    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
./subversion/include/svn_error.h:303:18: note: expanded from:
    svn_error_t *svn_err__temp = (expr);        \
                 ^               ~~~~~~
1 warning and 1 error generated.
*** [subversion/libsvn_client/commit.lo] Error code 1
2 errors
*** [do-build] Error code 1

Stop in /usr/ports/devel/subversion.
*** [build] Error code 1

Stop in /usr/ports/devel/subversion.

===>>> make failed for devel/subversion
===>>> Aborting update

===>>> Update for devel/subversion failed
===>>> Aborting update

Terminated

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