diff --git a/headers/posix/stdio.h b/headers/posix/stdio.h
index 5a695e1b07..b1853fe590 100644
--- a/headers/posix/stdio.h
+++ b/headers/posix/stdio.h
@@ -95,6 +95,10 @@ extern FILE		*popen(const char *command, const char *mode);
 extern int		pclose(FILE *stream);
 extern void		perror(const char *errorPrefix);
 
+/* memory streams */
+extern FILE		*fmemopen(void *buf, size_t size, const char *mode);
+extern FILE		*open_memstream(void **buf, size_t *size);
+
 /* file I/O */
 extern int		fflush(FILE *stream);
 extern int		fflush_unlocked(FILE *stream);
diff --git a/src/system/libroot/posix/glibc/libio/Jamfile b/src/system/libroot/posix/glibc/libio/Jamfile
index 1c430f74ff..2e10d5ae7d 100644
--- a/src/system/libroot/posix/glibc/libio/Jamfile
+++ b/src/system/libroot/posix/glibc/libio/Jamfile
@@ -30,6 +30,7 @@ MergeObject posix_gnu_libio.o :
 	filedoalloc.c
 	fileops.c
 	flockfile.c
+	fmemopen.c
 	fputc.c
 	fputc_u.c
 	freopen.c
@@ -49,6 +50,7 @@ MergeObject posix_gnu_libio.o :
 	iofgets.c
 	iofgets_u.c
 	iofopen.c
+	iofopncook.c
 	iofputs.c
 	iofputs_u.c
 	iofread.c
@@ -72,6 +74,7 @@ MergeObject posix_gnu_libio.o :
 	iovdprintf.c
 	iovsprintf.c
 	iovsscanf.c
+	memstream.c
 #	obprintf.c
 	pclose.c
 	peekc.c