http://lists.gnu.org/archive/html/bug-gnu-libiconv/2018-05/msg00004.html
--- libiconv-1.15/lib/Makefile.in
+++ libiconv-1.15/lib/Makefile.in
@@ -100,12 +100,14 @@
# On AIX, libiconv.a must include the object files of /lib/libiconv.a,
# otherwise the setlocale() call fails when invoked from executables linked
-# with -rpath $(libdir), even if linked without -liconv.
+# with -rpath $(libdir), even if linked without -liconv. However, since
+# the --with-aix-soname flag libtool may not create libiconv.a at all.
install : all force
if [ ! -d $(DESTDIR)$(libdir) ] ; then $(mkinstalldirs) $(DESTDIR)$(libdir) ; fi
$(LIBTOOL_INSTALL) $(INSTALL) libiconv.la $(DESTDIR)$(libdir)/libiconv.la
case "@host_os@" in \
aix*) (cd $(DESTDIR)$(libdir) && \
+ { test -e libiconv.a || exit 0; } && \
objects=`ar t libiconv.a`" "`ar t /lib/libiconv.a` && \
ar x libiconv.a && ar x /lib/libiconv.a && \
ar q libiconv.new.a $$objects && \