--- a/configure.ac	2015-10-15 15:16:57.000000000 +0200
+++ b/configure.ac	2015-11-20 05:32:57.723901582 +0100
@@ -305,6 +305,62 @@
 fi
 AC_SUBST([argp_LDADD])
 
+dnl Check if we have fts available from our libc
+AC_LINK_IFELSE(
+	[AC_LANG_PROGRAM(
+		[#if !defined(__x86_64__)
+		#undef  _FILE_OFFSET_BITS
+		#define _FILE_OFFSET_BITS 32
+		#endif
+		#include <fts.h>],
+		[FTS* fts = 0; return fts_close(fts); return 0;]
+		)],
+	[libc_has_fts="true"],
+	[libc_has_fts="false"]
+)
+
+dnl If our libc doesn't provide fts, then test for libfts
+if test "$libc_has_fts" = "false" ; then
+	AC_MSG_WARN("libc does not have fts")
+	AC_CHECK_LIB([fts], [fts_close], [have_fts="true"], [have_fts="false"])
+
+	if test "$have_fts" = "false"; then
+		AC_MSG_ERROR("no libfts found")
+	else
+		fts_LDADD="-lfts"
+	fi
+else
+	fts_LDADD=""
+fi
+AC_SUBST([fts_LDADD])
+
+dnl Check if we have obstack available from our libc
+AC_LINK_IFELSE(
+	[AC_LANG_PROGRAM(
+		[#include <obstack.h>],
+		[_obstack_begin(0, 0, 0, NULL, NULL); return 0;]
+		)],
+	[libc_has_obstack="true"],
+	[libc_has_obstack="false"]
+)
+
+dnl If our libc doesn't provide obstack, then test for libobstack
+if test "$libc_has_obstack" = "false" ; then
+	AC_MSG_WARN("libc does not have obstack")
+	AC_CHECK_LIB([obstack], [_obstack_begin], [have_obstack="true"], [have_obstack="false"])
+
+	if test "$have_obstack" = "false"; then
+		AC_MSG_ERROR("no libobstack found")
+	else
+		obstack_LDADD="-lobstack"
+	fi
+else
+	obstack_LDADD=""
+fi
+AC_SUBST([obstack_LDADD])
+
+dnl The directories with content.
+
 dnl The directories with content.
 
 dnl Documentation.
--- a/src/Makefile.am.orig
+++ b/src/Makefile.am
@@ -46,7 +46,7 @@
 else
 libasm = ../libasm/libasm.so
 libdw = ../libdw/libdw.so
-libelf = ../libelf/libelf.so
+libelf = ../libelf/libelf.so $(fts_LDADD) $(obstack_LDADD)
 endif
 libebl = ../libebl/libebl.a
 libeu = ../lib/libeu.a
--- a/libdw/Makefile.am.orig
+++ b/libdw/Makefile.am
@@ -109,7 +109,7 @@
 		../libcpu/libcpu_pic.a libdw_pic.a ../libdwelf/libdwelf_pic.a \
 		../libdwfl/libdwfl_pic.a
 libdw_so_DEPS = ../lib/libeu.a ../libelf/libelf.so
-libdw_so_LDLIBS = $(libdw_so_DEPS) -ldl -lz $(argp_LDADD) $(zip_LIBS) -pthread
+libdw_so_LDLIBS = $(libdw_so_DEPS) -ldl -lz $(argp_LDADD) $(fts_LDADD) $(obstack_LDADD) $(zip_LIBS) -pthread
 libdw_so_SOURCES =
 libdw.so$(EXEEXT): $(srcdir)/libdw.map $(libdw_so_LIBS) $(libdw_so_DEPS)
 	$(AM_V_CCLD)$(LINK) $(dso_LDFLAGS) -o $@ \