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--- diffextern.h
+++ diffextern.h
@@ -0,0 +1,102 @@
+/* diffextern.h 2.11.1 20/08/26 */
+
+/*
+ * diff external - common declarations
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <ctype.h>
+#include <sys/param.h>
+#include <sys/stat.h>
+#include <dirent.h>
+#include <signal.h>
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/wait.h>
+#include <arpa/inet.h>
+
+/*
+ * Output format options
+ */
+extern int opt;
+
+#define D_NORMAL 0 /* Normal output */
+#define D_EDIT -1 /* Editor script out */
+#define D_REVERSE 1 /* Reverse editor script */
+#define D_CONTEXT 2 /* Diff with context */
+#define D_IFDEF 3 /* Diff with merged #ifdef's */
+#define D_NREVERSE 4 /* Reverse ed script with numbered
+ lines and no trailing . */
+
+extern int tflag; /* expand tabs on output */
+
+/*
+ * Algorithm related options
+ */
+extern int hflag; /* -h, use halfhearted DIFFH */
+extern int bflag; /* ignore blanks in comparisons */
+extern int wflag; /* totally ignore blanks in comparisons */
+extern int iflag; /* ignore case in comparisons */
+
+/*
+ * Options on hierarchical diffs.
+ */
+extern int lflag; /* long output format with header */
+extern int rflag; /* recursively trace directories */
+extern int sflag; /* announce files which are same */
+extern char *start; /* do file only if name >= this */
+
+/*
+ * Variables for -I D_IFDEF option.
+ */
+extern int wantelses; /* -E */
+extern char *ifdef1; /* String for -1 */
+extern char *ifdef2; /* String for -2 */
+extern char *endifname; /* What we will print on next #endif */
+extern int inifdef;
+
+/*
+ * Variables for -c context option.
+ */
+extern int context; /* lines of context to be printed */
+
+/*
+ * State for exit status.
+ */
+extern int status;
+extern int anychange;
+extern char tempfile[MAXPATHLEN];/* used when comparing against std input */
+
+/*
+ * Variables for diffdir.
+ */
+extern char **diffargv; /* option list to pass to recursive diffs */
+
+/*
+ * Input file names.
+ * With diffdir, file1 and file2 are allocated BUFSIZ space,
+ * and padded with a '/', and then efile0 and efile1 point after
+ * the '/'.
+ */
+extern char *file1, *file2, *efile1, *efile2;
+extern struct stat stb1, stb2;
+
+char *talloc(), *ralloc();
+char *savestr(), *splice(), *splicen();
+char *copytemp();
+sig_t done();
+
+extern char diffh[], diff[], pr[];
+
+/* declarations */
+void diffdir(char **argv);
+void diffreg();
+void noroom();
+void setfile(char **fpp, char **epp, char *file);
+int useless(register char *cp);
+int min(int, int);
+int max(int, int);
+void prune();
+int skipline(int);
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