diff -up FlopC++-1.2.5/configure.orig FlopC++-1.2.5/configure
--- FlopC++-1.2.5/configure.orig	2019-02-23 10:58:12.000000000 -0700
+++ FlopC++-1.2.5/configure	2019-06-21 13:35:59.339921743 -0600
@@ -22625,7 +22625,7 @@ echo "${ECHO_T}$doxysrcdir (src)" >&6
   fi
   # Not built, fall back to installed tag file
   if test $doxyfound = no ; then
-    eval doxydir="${datadir}/coin/doc/${proj}/doxydoc"
+    eval doxydir="${datadir}/doc/coin-or-${proj}"
     # AC_MSG_NOTICE([Considering $doxydir (install)])
     # AC_MSG_NOTICE([Subdirs: $coin_subdirs)])
     coin_doxy_tagfiles="$coin_doxy_tagfiles $doxydir/$doxytag=$doxydir/html"
diff -up FlopC++-1.2.5/Makefile.in.orig FlopC++-1.2.5/Makefile.in
--- FlopC++-1.2.5/Makefile.in.orig	2015-03-29 18:33:47.000000000 -0600
+++ FlopC++-1.2.5/Makefile.in	2019-06-21 13:35:27.541460693 -0600
@@ -319,7 +319,7 @@ EXTRA_DIST = $(am__append_2)
 ########################################################################
 pkgconfiglibdir = $(libdir)/pkgconfig
 pkgconfiglib_DATA = flopcpp.pc
-addlibsdir = $(DESTDIR)$(datadir)/coin/doc/FlopCpp
+addlibsdir = $(DESTDIR)$(datadir)/doc/coin-or-FlopC++
 
 ########################################################################
 #                         Maintainer Stuff                             #
@@ -328,7 +328,7 @@ addlibsdir = $(DESTDIR)$(datadir)/coin/d
 # Files that are generated and should be cleaned with make distclean
 DISTCLEANFILES = $(am__append_3) $(VPATH_DISTCLEANFILES)
 DocFiles = README AUTHORS LICENSE 
-DocInstallDir = $(datadir)/coin/doc/$(PACKAGE_NAME)
+DocInstallDir = $(datadir)/doc/coin-or-FlopC++
 COIN_HAS_DOXYGEN = @COIN_HAS_DOXYGEN_TRUE@TRUE
 COIN_HAS_LATEX = @COIN_HAS_LATEX_TRUE@TRUE
 all: all-recursive