Index: uspace/app/binutils/Makefile
===================================================================
--- uspace/app/binutils/Makefile	(revision d9006997e0426015afb8c80b3b2fb49e4f256ee6)
+++ uspace/app/binutils/Makefile	(revision f3a605bea58d01160f350e7db4258753b8362dec)
@@ -88,4 +88,12 @@
 BINUTILS_CONFIGURED = $(REDIST_DIR)/Makefile
 
+# Generated source file for libposix function stubs without posix_ prefix.
+CONFOBJ_SOURCE = ./confobj.c
+
+# Dummy object file for libposix function stubs without posix_ prefix..
+# Required by binutils configure script tests that links against symbols
+# without including headers (which means that symbols are not prefixed).
+CONFOBJ_OBJECT = $(subst $(space),\ ,$(shell pwd))/confobj.o
+
 # Map the HelenOS target to binutils target.
 ifeq ($(PLATFORM),amd64)
@@ -133,5 +141,5 @@
 ifeq ($(COMPILER),$(findstring $(COMPILER),$(SUPPORTED_COMPILERS)))
 all: $(COMMON_MAKEFILE_PATCHED) all_ $(TOOLCHAIN) $(BINUTILS_PATCHED) \
-		$(BINUTILS_CONFIGURED) $(REDIST_DETECT)
+		$(CONFOBJ_OBJECT) $(BINUTILS_CONFIGURED) $(REDIST_DETECT)
 	make -C $(REDIST_DIR) $(MAKE_TARGETS)
 	cp -f $(REDIST_DIR)/gas/as-new ./as
@@ -156,11 +164,24 @@
 	touch $@
 
+# Generate stubs for libposix functions without posix_ prefix.
+$(CONFOBJ_SOURCE):
+	echo '/* GENERATED FILE. DO NOT MODIFY. */' > $@; \
+	grep -r -o -h -I -E 'posix_[^ \(]*\(' $(LIBPOSIX_PREFIX) | \
+	sort -u | \
+	sed 's/posix_\([^ (]*\)(/char \1() { return 0; }/g' >> $@
+
+# Compile dummy object for configure script tests.
+$(CONFOBJ_OBJECT): $(CONFOBJ_SOURCE) $(TOOLCHAIN)
+	./gcc -c -o $@ $<
+
 # Generate false toolchain scripts.
 $(TOOLCHAIN): $(TOOLCHAIN_SCRIPT)
-	./$< gcc $(CC) '$(CFLAGS)'
+	./$< gcc $(CC) \
+		'$(CFLAGS)' '$(LINKER_SCRIPT)' '$(LIBS) $(BASE_LIBS) $(CONFOBJ_OBJECT)'
 	./$< as $(AS)
 	./$< ar $(AR)
 	./$< ranlib
-	./$< ld $(LD) '$(LFLAGS)' '$(LINKER_SCRIPT)' '$(LIBS) $(BASE_LIBS)'
+	./$< ld $(LD) \
+		'$(LFLAGS)' '$(LINKER_SCRIPT)' '$(LIBS) $(BASE_LIBS)'
 	./$< objdump $(OBJDUMP)
 	./$< objcopy $(OBJCOPY)
@@ -185,4 +206,5 @@
 clean: $(BINUTILS_PATCH) clean_
 	rm -f as ld
+	rm -f $(CONFOBJ_SOURCE) $(CONFOBJ_OBJECT)
 	if [ -e $(REDIST_DIR)/Makefile ]; then \
 		make -C $(REDIST_DIR) distclean; \
Index: uspace/app/binutils/toolchain.sh
===================================================================
--- uspace/app/binutils/toolchain.sh	(revision d9006997e0426015afb8c80b3b2fb49e4f256ee6)
+++ uspace/app/binutils/toolchain.sh	(revision f3a605bea58d01160f350e7db4258753b8362dec)
@@ -52,5 +52,6 @@
 # special approach because binutils use it for both compilation and
 # linkage. In case the linking usage is detected, the call is redirected
-# to the linker.
+# to the linker. There is also special case for configure script tests
+# that require compiler link step.
 #
 
@@ -77,6 +78,13 @@
 			sed 's/-g//g' | \
 			sed 's/ [ ]*/ /g'`"
-		echo '	echo' \'"$2"\' \'"$CFLAGS"\' '"$@"'
-		echo "	$2" "$CFLAGS" '$@'
+		echo '	CONFTEST="`echo $* | grep '\' conftest \''`"'
+		echo '	if [ -n "$CONFTEST" ]; then'
+		echo '		LFLAGS="-Xlinker -z -Xlinker muldefs"'
+		echo '		echo' \'"$2 $CFLAGS -T $4"\' '"$LFLAGS"' '"$@"' \'"$5"\'
+		echo "		$2 $CFLAGS -T $4" '$LFLAGS' '$@' "$5"
+		echo '	else'
+		echo '		echo' \'"$2 $CFLAGS"\' '"$@"'
+		echo "		$2 $CFLAGS" '$@'
+		echo '	fi'
 		echo 'fi'
 		) > 'gcc'