nixpkgs/pkgs/test/checkpointBuild/hello-additionalFile.patch

:100644 100644 0000000 0000000 M	Makefile.in
:000000 100644 0000000 0000000 A	src/additionalFile.c
:100644 100644 0000000 0000000 M	src/hello.c
:100644 100644 0000000 0000000 M	src/system.h

diff --git a/Makefile.in b/Makefile.in
index 1597d39..f63f830 100644
--- a/Makefile.in
+++ b/Makefile.in
@@ -312,7 +312,7 @@ am_lib_libhello_a_OBJECTS = lib/basename-lgpl.$(OBJEXT) \
 	lib/version-etc.$(OBJEXT) lib/version-etc-fsf.$(OBJEXT) \
 	lib/wctype-h.$(OBJEXT) lib/xmalloc.$(OBJEXT) \
 	lib/xalloc-die.$(OBJEXT) lib/xstriconv.$(OBJEXT) \
-	lib/xstrndup.$(OBJEXT)
+	lib/xstrndup.$(OBJEXT) src/additionalFile.$(OBJEXT)
 lib_libhello_a_OBJECTS = $(am_lib_libhello_a_OBJECTS)
 am_hello_OBJECTS = src/hello.$(OBJEXT)
 hello_OBJECTS = $(am_hello_OBJECTS)
@@ -1842,7 +1842,7 @@ lib_libhello_a_SOURCES = lib/basename-lgpl.c lib/c-ctype.h \
 	$(am__append_4) $(am__append_5) lib/version-etc.h \
 	lib/version-etc.c lib/version-etc-fsf.c lib/wctype-h.c \
 	lib/xmalloc.c lib/xalloc-die.c lib/xstriconv.h lib/xstriconv.c \
-	lib/xstrndup.h lib/xstrndup.c
+	lib/xstrndup.h lib/xstrndup.c src/additionalFile.c
 lib_libhello_a_LIBADD = $(gl_LIBOBJS)
 lib_libhello_a_DEPENDENCIES = $(gl_LIBOBJS)
 EXTRA_lib_libhello_a_SOURCES = lib/close.c lib/stripslash.c lib/dup2.c \
diff --git a/src/additionalFile.c b/src/additionalFile.c
new file mode 100644
index 0000000..34d683d
--- /dev/null
+++ b/src/additionalFile.c
@@ -0,0 +1,6 @@
+#include "config.h"
+#include "system.h"
+
+int somefunc() {
+    return 0;
+}
diff --git a/src/hello.c b/src/hello.c
index 2e7d38e..a8e36dc 100644
--- a/src/hello.c
+++ b/src/hello.c
@@ -146,7 +146,11 @@ main (int argc, char *argv[])
 #endif
 
   /* Having initialized gettext, get the default message. */
-  greeting_msg = _("Hello, world!");
+  if (somefunc() == 0) {
+    greeting_msg = _("Hello, world!");
+  } else {
+    greeting_msg = _("Hello, incremental world!");
+  }
 
   /* Even exiting has subtleties.  On exit, if any writes failed, change
      the exit status.  The /dev/full device on GNU/Linux can be used for
diff --git a/src/system.h b/src/system.h
index d39cdb9..dc425d2 100644
--- a/src/system.h
+++ b/src/system.h
@@ -59,4 +59,6 @@
     } \
   while (0)
 
+int somefunc();
+
 #endif /* HELLO_SYSTEM_H */