--- /dev/null
+--- a/gcc/gcc.c
++++ b/gcc/gcc.c
+@@ -8583,7 +8583,10 @@ getenv_spec_function (int argc, const ch
+
+ value = getenv (argv[0]);
+ if (!value)
+- fatal ("environment variable \"%s\" not defined", argv[0]);
++ {
++ warning (0, "environment variable \"%s\" not defined", argv[0]);
++ value = "";
++ }
+
+ /* We have to escape every character of the environment variable so
+ they are not interpreted as active spec characters. A
--- /dev/null
+--- a/gcc/gcc.c
++++ b/gcc/gcc.c
+@@ -7772,7 +7772,10 @@ getenv_spec_function (int argc, const ch
+
+ value = getenv (argv[0]);
+ if (!value)
+- fatal_error ("environment variable %qs not defined", argv[0]);
++ {
++ warning (0, "environment variable %qs not defined", argv[0]);
++ value = "";
++ }
+
+ /* We have to escape every character of the environment variable so
+ they are not interpreted as active spec characters. A
--- /dev/null
+--- a/gcc/gcc.c
++++ b/gcc/gcc.c
+@@ -7772,7 +7772,10 @@ getenv_spec_function (int argc, const ch
+
+ value = getenv (argv[0]);
+ if (!value)
+- fatal_error ("environment variable %qs not defined", argv[0]);
++ {
++ warning (0, "environment variable %qs not defined", argv[0]);
++ value = "";
++ }
+
+ /* We have to escape every character of the environment variable so
+ they are not interpreted as active spec characters. A
--- /dev/null
+--- a/gcc/gcc.c
++++ b/gcc/gcc.c
+@@ -7814,7 +7814,10 @@ getenv_spec_function (int argc, const ch
+
+ value = getenv (argv[0]);
+ if (!value)
+- fatal_error ("environment variable %qs not defined", argv[0]);
++ {
++ warning (0, "environment variable %qs not defined", argv[0]);
++ value = "";
++ }
+
+ /* We have to escape every character of the environment variable so
+ they are not interpreted as active spec characters. A