diff -Nurd -x'*~' xplot-0.90.7.1.orig/Makefile.in xplot-0.90.7.1/Makefile.in
--- xplot-0.90.7.1.orig/Makefile.in	2000-05-04 17:04:20.000000000 -0400
+++ xplot-0.90.7.1/Makefile.in	2018-05-05 23:50:34.000000000 -0400
@@ -37,8 +37,9 @@
 DEFINES= 
 
 CC= @CC@
-CFLAGS=@CFLAGS@ ${DEFINES}
-LIBS= @LIBS@
+CFLAGS=@CFLAGS@
+CPPFLAGS=@CPPFLAGS@ ${DEFINES}
+LIBS= @LDFLAGS@ @LIBS@
 
 INSTALL = @INSTALL@
 INSTALL_PROGRAM = @INSTALL_PROGRAM@
@@ -49,8 +50,8 @@
 
 exec_prefix = @exec_prefix@
 
-bindir = $(exec_prefix)/bin
-mandir = $(exec_prefix)/man/man1
+bindir = ${DESTDIR}$(exec_prefix)/bin
+mandir = ${DESTDIR}$(exec_prefix)/share/man/man1
 
 CFILES= xplot.c version_string.c coord.c unsigned.c signed.c timeval.c double.c dtime.c
 OFILES= xplot.o version_string.o coord.o unsigned.o signed.o timeval.o double.o dtime.o
@@ -62,9 +63,7 @@
 all:	${PROG}
 
 ${PROG}: ${OFILES}
-	${CC} ${CFLAGS} -o $@.new ${OFILES} ${LIBS}
-	-mv -f $@ $@.old
-	mv -f $@.new $@
+	${CC} ${CFLAGS} -o $@ ${OFILES} ${LIBS}
 
 version_string.c: version
 	echo 'char *version_string = "'`cat version`'";' >version_string.c
diff -Nurd -x'*~' xplot-0.90.7.1.orig/configure.in xplot-0.90.7.1/configure.in
--- xplot-0.90.7.1.orig/configure.in	1998-06-18 13:50:40.000000000 -0400
+++ xplot-0.90.7.1/configure.in	2018-05-05 23:37:59.000000000 -0400
@@ -14,11 +14,11 @@
 dnl This must be done BEFORE checking for the X libraries
 AC_PATH_XTRA
 LIBS="$LIBS $X_LIBS"
-CFLAGS="$CFLAGS $X_CFLAGS"
+CPPFLAGS="$CPPFLAGS $X_CFLAGS"
 
 dnl Checks for libraries.
 dnl Replace `main' with a function in -lX11:
-AC_CHECK_LIB(X11, main)
+AC_CHECK_LIB(X11, XOpenDisplay)
 dnl Replace `main' with a function in -lm:
 AC_CHECK_LIB(m, main)
 
@@ -26,8 +26,21 @@
 AC_C_INLINE
 AC_HEADER_STDC
 AC_HEADER_TIME
-
 AC_STRUCT_TM
+
+AC_DEFUN([AC_TM_GMTOFF],
+[AC_MSG_CHECKING([whether struct tm has tm_gmtoff])
+AC_CACHE_VAL(ac_cv_tm_gmtoff,
+[AC_TRY_COMPILE([#include <sys/types.h>
+#include <time.h>],
+[struct tm *tp; tp->tm_gmtoff;],
+  ac_cv_tm_gmtoff=yes, ac_cv_tm_gmtoff=0)])dnl
+AC_MSG_RESULT($ac_cv_tm_gmtoff)
+if test $ac_cv_tm_gmtoff = yes; then
+  AC_DEFINE([TM_GMTOFF], 1, [Define if struct tm has gmtoff])
+fi
+])
+
 AC_TM_GMTOFF
 
 dnl Checks for library functions.
diff -Nurd -x'*~' xplot-0.90.7.1.orig/version_string.c xplot-0.90.7.1/version_string.c
--- xplot-0.90.7.1.orig/version_string.c	1969-12-31 19:00:00.000000000 -0500
+++ xplot-0.90.7.1/version_string.c	2006-06-27 01:38:18.000000000 -0400
@@ -0,0 +1 @@
+char *version_string = "0.90.7.1";
diff -Nurd -x'*~' xplot-0.90.7.1.orig/xplot.1 xplot-0.90.7.1/xplot.1
--- xplot-0.90.7.1.orig/xplot.1	1999-02-04 12:49:57.000000000 -0500
+++ xplot-0.90.7.1/xplot.1	2006-06-27 01:46:32.000000000 -0400
@@ -103,9 +103,9 @@
 .Pa demo.1, 
 .Pa demo.2,
 etc., 
-stored with the 
-.Nm xplot
-sources.  
+available in
+.Pa @PREFIX@/share/doc/xplot
+For your perusal.
 .Pa demo.0
 lists all the commands.
 .Dl xplot demo.0