diff --git a/config.sub b/config.sub
index 75bb6a313..8b9d9df39 100755
--- a/config.sub
+++ b/config.sub
@@ -1336,7 +1336,7 @@ case $os in
 	# The portable systems comes first.
 	# Each alternative MUST end in a * to match a version number.
 	# sysv* is not here because it comes later, after sysvr4.
-	gnu* | bsd* | mach* | minix* | genix* | ultrix* | irix* \
+	gnu* | bsd* | mach* | minix* | genix* | ultrix* | irix* | myos* \
 	     | *vms* | esix* | aix* | cnk* | sunos | sunos[34]*\
 	     | hpux* | unos* | osf* | luna* | dgux* | auroraux* | solaris* \
 	     | sym* | kopensolaris* | plan9* \
diff --git a/fixincludes/mkfixinc.sh b/fixincludes/mkfixinc.sh
index 0f9648608..7e152d0ae 100755
--- a/fixincludes/mkfixinc.sh
+++ b/fixincludes/mkfixinc.sh
@@ -11,6 +11,7 @@ target=fixinc.sh
 
 # Check for special fix rules for particular targets
 case $machine in
+    *-myos* | \
     i?86-*-cygwin* | \
     i?86-*-mingw32* | \
     x86_64-*-mingw32* | \
diff --git a/gcc/config.gcc b/gcc/config.gcc
index ddd3b8f4d..af54596be 100644
--- a/gcc/config.gcc
+++ b/gcc/config.gcc
@@ -675,6 +675,12 @@ x86_cpus="generic intel"
 
 # Common parts for widely ported systems.
 case ${target} in
+*-*-myos*)
+  gas=yes
+  gnu_ld=yes
+  default_use_cxa_atexit=yes
+  use_gcc_stdint=provide
+  ;;
 *-*-darwin*)
   tmake_file="t-darwin "
   tm_file="${tm_file} darwin.h"
@@ -978,6 +984,12 @@ case ${target} in
 esac
 
 case ${target} in
+i[34567]86-*-myos*)
+    tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h glibc-stdint.h i386/i386elf.h myos.h"
+    ;;
+x86_64-*-myos*)
+    tm_file="${tm_file} i386/unix.h i386/att.h dbxelf.h elfos.h glibc-stdint.h i386/i386elf.h i386/x86-64.h myos.h"
+    ;;
 aarch64*-*-elf | aarch64*-*-fuchsia* | aarch64*-*-rtems*)
 	tm_file="${tm_file} dbxelf.h elfos.h newlib-stdint.h"
 	tm_file="${tm_file} aarch64/aarch64-elf.h aarch64/aarch64-elf-raw.h"
diff --git a/gcc/config/myos.h b/gcc/config/myos.h
new file mode 100644
index 000000000..4930cc299
--- /dev/null
+++ b/gcc/config/myos.h
@@ -0,0 +1,28 @@
+/* Useful if you wish to make target-specific GCC changes. */
+#undef TARGET_MYOS
+#define TARGET_MYOS 1
+
+/* Default arguments you want when running your
+   i686-myos-gcc/x86_64-myos-gcc toolchain */
+#undef LIB_SPEC
+#define LIB_SPEC "-lc" /* link against C standard library */
+
+/* Files that are linked before user code.
+   The %s tells GCC to look for these files in the library directory. */
+#undef STARTFILE_SPEC
+#define STARTFILE_SPEC "crt0.o%s crti.o%s crtbegin.o%s"
+
+/* Files that are linked after user code. */
+#undef ENDFILE_SPEC
+#define ENDFILE_SPEC "crtend.o%s crtn.o%s"
+
+/* Additional predefined macros. */
+#undef TARGET_OS_CPP_BUILTINS
+#define TARGET_OS_CPP_BUILTINS()      \
+  do {                                \
+    builtin_define ("__myos__");      \
+    builtin_define ("__unix__");      \
+    builtin_assert ("system=myos");   \
+    builtin_assert ("system=unix");   \
+    builtin_assert ("system=posix");   \
+  } while(0);
diff --git a/libgcc/config.host b/libgcc/config.host
index 91abc84da..d2941a089 100644
--- a/libgcc/config.host
+++ b/libgcc/config.host
@@ -343,6 +343,14 @@ i[34567]86-*-cygwin* | x86_64-*-cygwin*)
 esac
 
 case ${host} in
+i[34567]86-*-myos*)
+	extra_parts="$extra_parts crti.o crtbegin.o crtend.o crtn.o"
+	tmake_file="$tmake_file i386/t-crtstuff t-crtstuff-pic t-libgcc-pic"
+	;;
+x86_64-*-myos*)
+	extra_parts="$extra_parts crti.o crtbegin.o crtend.o crtn.o"
+	tmake_file="$tmake_file i386/t-crtstuff t-crtstuff-pic t-libgcc-pic"
+	;;
 aarch64*-*-elf | aarch64*-*-rtems*)
 	extra_parts="$extra_parts crtbegin.o crtend.o crti.o crtn.o"
 	extra_parts="$extra_parts crtfastmath.o"
diff --git a/libstdc++-v3/crossconfig.m4 b/libstdc++-v3/crossconfig.m4
index 344eec09d..eb7030daa 100644
--- a/libstdc++-v3/crossconfig.m4
+++ b/libstdc++-v3/crossconfig.m4
@@ -5,6 +5,12 @@ dnl
 AC_DEFUN([GLIBCXX_CROSSCONFIG],[
 # Base decisions on target environment.
 case "${host}" in
+  *-myos*)
+    GLIBCXX_CHECK_COMPILER_FEATURES
+    GLIBCXX_CHECK_LINKER_FEATURES
+    GLIBCXX_CHECK_MATH_SUPPORT
+    GLIBCXX_CHECK_STDLIB_SUPPORT
+    ;;
   arm*-*-symbianelf*)
     # This is a freestanding configuration; there is nothing to do here.
     ;;