--- a/Makefile.in	1995-08-16 20:54:29.000000000 -0400
+++ b/Makefile.in	2012-12-05 11:45:11.124478718 -0500
@@ -75,8 +75,6 @@
 	$(INSTALL_DATA) libtermcap.a $(libdir)/libtermcap.a
 	-$(RANLIB) $(libdir)/libtermcap.a
 	cd $(srcdir); $(INSTALL_DATA) termcap.h $(includedir)/termcap.h
-	-cd $(srcdir); test -z "$(oldincludedir)" || \
-	  $(INSTALL_DATA) termcap.h $(oldincludedir)/termcap.h
 	cd $(srcdir); for f in termcap.info*; \
 	do $(INSTALL_DATA) $$f $(infodir)/$$f; done
 

Note that CE is missing from this entry because it causes
trouble for Octave.  Instead of performing the action, it
is echoed to the terminal window when Readline tputs it to
the terminal.

diff -uNr a/termcap.c b/termcap.c
--- a/termcap.c	2002-02-25 12:59:21.000000000 -0500
+++ b/termcap.c	2018-03-01 13:16:17.960763846 -0500
@@ -120,6 +120,26 @@
 }
 #endif /* not emacs */
 
+
+#define INTERNAL_TERMINAL \
+  "cygwin:\
+	:am:bs:mi:ms:xo:\
+	:Co#8:NC#3:co#80:li#25:pa#64:\
+	:@7=\\E[4~:AB=\\E[4%dm:AF=\\E[3%dm:F1=\\E[23~:F2=\\E[24~:\
+	:F3=\\E[25~:F4=\\E[26~:F5=\\E[28~:F6=\\E[29~:F7=\\E[31~:\
+	:F8=\\E[32~:F9=\\E[33~:FA=\\E[34~:S2=\\E[11m:S3=\\E[10m:\
+	:ac=`\004a\261f\370g\361h\260j\331k\277l\332m\300n\305o~q\304r\362s_t\303u\264v\301w\302x\263y\371z\372{\373|\374}\375~\376.\031-\030,\021+^P0\333p\304r\304y\363z\362{\343|\330}\234:\
+	:ae=\\E[10m:as=\\E[11m:cl=\\E[2J:cm=\\E[%i%d;%dH:\
+	:do=\\E[B:ho=\\E[H:is=\\E[m\\E[?7h:k1=\\E[[A:k2=\\E[[B:k3=\\E[[C:\
+	:k4=\\E[[D:k5=\\E[[E:k6=\\E[17~:k7=\\E[18~:k8=\\E[19~:\
+	:k9=\\E[20~:k;=\\E[21~:kD=\\E[3~:kI=\\E[2~:kN=\\E[6~:kP=\\E[5~:\
+	:kd=\\E[B:kh=\\E[1~:kl=\\E[D:kr=\\E[C:ku=\\E[A:le=^H:mb=\\E[5m:\
+	:md=\\E[1m:me=\\E[0;10m:mk=\\E[8m:mr=\\E[7m:nd=\\E[C:\
+	:op=\\E[37;40m:pk=\\E[0;%+\:;\"%s\":rc=\\E[u:\
+	:..sa=\\E[0;10%?%p1%t;7%;%?%p2%t;4%;%?%p3%t;7%;%?%p4%t;5%;%?%p6%t;1%;%?%p7%t;8%;%?%p9%t;11%;m:\
+	:sc=\\E[s:se=\\E[m:so=\\E[7m:u6=\\E[%i%d;%dR:u7=\\E[6n:ue=\\E[m:\
+	:up=\\E[A:us=\\E[4m:"
+
 /* Looking up capabilities in the entry already found.  */
 
 /* The pointer to the data made by tgetent is left here
@@ -464,7 +484,7 @@
 #ifdef INTERNAL_TERMINAL
   /* For the internal terminal we don't want to read any termcap file,
      so fake it.  */
-  if (!strcmp (name, "internal"))
+  if (!strcmp (name, "cygwin"))
     {
       term = INTERNAL_TERMINAL;
       if (!bp)