Do not include term.h and curses.h in terminal.c without checking that

they exist.  Modern ncurses does not need curses.h to compile term.h
so that header has been removed.  Also make ncurses the last choice
when looking for tputs().

configure.ac

@@ -1274,7 +1274,7 @@ else
                 AC_CHECK_HEADERS([readline/readline.h readline/history.h],
                     [AC_DEFINE([HAVE_GNUREADLINE], [], [Define if we have GNU readline])],
                     [AC_MSG_ERROR([Couldn't find GNU readline headers.])])
-                AC_SEARCH_LIBS([tputs], [ncurses tinfo termcap],
+                AC_SEARCH_LIBS([tputs], [tinfo termcap ncurses],
                     [AC_DEFINE([HAVE_TERMCAP], [], [Define if we have ncurses/terminfo or termcap])],
                     [AC_MSG_ERROR([Found neither ncurses/terminfo or termcap])])
                 AC_CHECK_LIB([readline], [readline],
@@ -1290,7 +1290,7 @@ else
 		       if test -f $dir/include/readline/readline.h && test -f $dir/include/readline/history.h ; then
 
                             AC_DEFINE([HAVE_GNUREADLINE], [], [Define if we have GNU readline])
-			    AC_SEARCH_LIBS([tputs], [ncurses tinfo termcap],
+			    AC_SEARCH_LIBS([tputs], [tinfo termcap ncurses],
 			        [AC_DEFINE([HAVE_TERMCAP], [], [Define if we have ncurses/terminfo or termcap])],
 				[AC_MSG_ERROR([Found neither ncurses/terminfo or termcap])])
 			    AC_CHECK_LIB([readline], [readline],
@@ -1312,7 +1312,7 @@ else
         AC_CHECK_HEADERS([editline/readline.h],
             [AC_DEFINE([HAVE_BSDEDITLINE], [1], [Define to enable BSD editline])],
             [AC_MSG_ERROR([Couldn't find BSD editline headers.])])
-        AC_SEARCH_LIBS([tputs], [ncurses tinfo termcap],
+        AC_SEARCH_LIBS([tputs], [tinfo termcap ncurses],
             [AC_DEFINE([HAVE_TERMCAP], [], [Define if we have ncurses/terminfo or termcap])],
             [AC_MSG_ERROR([Found neither ncurses/terminfo or termcap])])
         AC_CHECK_LIB([edit], [readline],
@@ -1323,7 +1323,7 @@ else
 fi
 
 # Use AC_CHECK_HEADERS so the HAVE_*_H symbol gets defined
-AC_CHECK_HEADERS([ncurses/termcap.h termcap.h])
+AC_CHECK_HEADERS([ncurses/termcap.h termcap.h term.h])
 AC_CHECK_HEADERS([sys/sysctl.h])
 
 # Add OpenMP to ngspice.

src/frontend/terminal.c

@@ -21,19 +21,6 @@ Author: 1986 Wayne A. Christopher, U. C. Berkeley CAD Group
 #include <sys/ioctl.h>
 #endif
 
-
-#ifdef HAVE_TERMCAP
-#include <curses.h>
-#include <term.h>
-#endif
-
-
-#ifdef HAVE_TERMCAP_H
-#include <termcap.h>
-#elif HAVE_NCURSES_TERMCAP_H
-#include <ncurses/termcap.h>
-#endif
-
 #include "ngspice/cpdefs.h"
 
 #include "variable.h"
@@ -45,6 +32,22 @@ bool out_isatty = TRUE;
 
 #if !defined (TCL_MODULE) && !defined (SHARED_MODULE)
 
+#ifdef HAVE_TERMCAP
+/* The tputs() function was found in a library, but there are several
+ * candidates for the header file location.
+ */
+
+#if HAVE_TERM_H
+#include <term.h>
+#elif HAVE_TERMCAP_H
+#include <termcap.h>
+#elif HAVE_NCURSES_TERMCAP_H
+#include <ncurses/termcap.h>
+#else
+#undef HAVE_TERMCAP
+#endif
+#endif
+
 #ifdef HAVE_TERMCAP
 static char *motion_chars;
 static char *clear_chars;