GNU m4 depends on libsigsegv

var/spack/repos/builtin/packages/libsigsegv/package.py

@@ -0,0 +1,15 @@
+from spack import *
+
+class Libsigsegv(Package):
+    """GNU libsigsegv is a library for handling page faults in user mode."""
+    homepage = "https://www.gnu.org/software/libsigsegv/"
+    url      = "ftp://ftp.gnu.org/gnu/libsigsegv/libsigsegv-2.10.tar.gz"
+
+    version('2.10', '7f96fb1f65b3b8cbc1582fb7be774f0f')
+
+    def install(self, spec, prefix):
+        configure('--prefix=%s' % prefix,
+                  '--enable-shared')
+
+        make()
+        make("install")

var/spack/repos/builtin/packages/m4/package.py

@@ -7,6 +7,8 @@ class M4(Package):
 
     version('1.4.17', 'a5e9954b1dae036762f7b13673a2cf76')
 
+    depends_on('libsigsegv')
+
     def install(self, spec, prefix):
         configure("--prefix=%s" % prefix)
         make()