diff --git a/.gitignore b/.gitignore
index 2fbf857..e9e0b1d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -14,3 +14,4 @@ libdap-3.10.2.tar.gz
 /libdap-3.18.1.tar.gz
 /libdap-3.18.2.tar.gz
 /libdap-3.18.3.tar.gz
+/libdap-3.19.1.tar.gz
diff --git a/libdap-3.19.1-use-libtirpc.patch b/libdap-3.19.1-use-libtirpc.patch
new file mode 100644
index 0000000..c057f68
--- /dev/null
+++ b/libdap-3.19.1-use-libtirpc.patch
@@ -0,0 +1,94 @@
+diff --git a/Makefile.am b/Makefile.am
+index f5dab89..8c90f30 100644
+--- a/Makefile.am
++++ b/Makefile.am
+@@ -6,7 +6,7 @@ ACLOCAL_AMFLAGS = -I conf -I gl/m4
+ aclocaldir=$(datadir)/aclocal
+ pkgconfigdir=$(libdir)/pkgconfig
+ 
+-AM_CPPFLAGS = -I$(top_builddir)/gl -I$(top_srcdir)/gl -I$(top_srcdir)/GNU $(XML2_CFLAGS)
++AM_CPPFLAGS = -I$(top_builddir)/gl -I$(top_srcdir)/gl -I$(top_srcdir)/GNU $(XML2_CFLAGS) $(TIRPC_CFLAGS)
+ AM_CXXFLAGS = 
+ 
+ if COMPILER_IS_GCC
+@@ -47,7 +47,7 @@ man_MANS = getdap.1 dap-config.1 getdap4.1
+ 	groff -t -e -mandoc -Tascii $< | col -bx > $@
+ 
+ libparsers_la_SOURCES = $(FLEX_SRC) $(BISON_SRC)  
+-libparsers_la_CPPFLAGS = $(XML2_CFLAGS)
++libparsers_la_CPPFLAGS = $(XML2_CFLAGS) $(TIRPC_CFLAGS)
+ libparsers_la_LIBADD = $(XML2_LIBS)
+ 
+ libdap_la_SOURCES = $(DAP_SRC) $(GNU_SRC)
+diff --git a/conf/acinclude.m4 b/conf/acinclude.m4
+index 63a17e7..df3d7c9 100644
+--- a/conf/acinclude.m4
++++ b/conf/acinclude.m4
+@@ -558,12 +558,23 @@ AC_DEFUN([DODS_CHECK_SIZES], [dnl
+     #
+     # Unfortunately, there is little commonality about xdr
+ 
+-    # First, we need to see if the xdr routines are in libc, librpc,
++    # First, we need to see if the xdr routines are in libtirpc, libc, librpc,
+     # or librpcsvc or libnsl
+     dap_xdrlib=
+-    AC_SEARCH_LIBS([xdr_void],[c rpc nsl rpcsvc],[
+-      dap_xdrlib=`echo $ac_res|sed -e 's/^-l//'`],[
+-      AC_MSG_WARN(Cannot locate library containing xdr functions.)])
++	PKG_PROG_PKG_CONFIG([0.9.0])
++	PKG_CHECK_MODULES([TIRPC], [libtirpc >= 0.2.4],
++		[dap_xdrlib=`echo "${TIRPC_LIBS}" | sed -e 's/^-l//'`
++		AC_SUBST([TIRPC_CFLAGS])
++		AC_SUBST([TIRPC_LIBS])
++		AC_DEFINE([HAVE_LIBTIRPC], [1], [Define to 1 to use libtirpc.])],
++		[dap_xdrlib=""]
++	)
++	AS_IF(
++	[test "$dap_xdrlib" = ""],
++    	[AC_SEARCH_LIBS([xdr_void],[c rpc nsl rpcsvc],[
++    	  dap_xdrlib=`echo $ac_res|sed -e 's/^-l//'`],[
++    	  AC_MSG_WARN(Cannot locate library containing xdr functions.)])])
++
+     # Added for autoconf 2.59 which appears to not use/set $ac_res. jhrg
+     if test -z "$dap_xdrlib" ; then dap_xdrlib=c; fi
+     if test "$dap_xdrlib" = "none required" ; then dap_xdrlib=c; fi
+diff --git a/d4_ce/Makefile.am b/d4_ce/Makefile.am
+index aa1a070..fcae7a4 100644
+--- a/d4_ce/Makefile.am
++++ b/d4_ce/Makefile.am
+@@ -7,7 +7,7 @@ AUTOMAKE_OPTIONS = foreign
+ .NOTPARALLEL:
+ 
+ # Arrange to build with the backward compatibility mode enabled.
+-AM_CPPFLAGS = -I$(top_srcdir) -I$(top_srcdir)/d4_ce -I$(srcdir) $(XML2_CFLAGS)
++AM_CPPFLAGS = -I$(top_srcdir) -I$(top_srcdir)/d4_ce -I$(srcdir) $(XML2_CFLAGS) $(TIRPC_CFLAGS)
+ AM_CXXFLAGS =  
+ 
+ if COMPILER_IS_GCC
+diff --git a/tests/Makefile.am b/tests/Makefile.am
+index f32e7d0..d51d255 100644
+--- a/tests/Makefile.am
++++ b/tests/Makefile.am
+@@ -4,7 +4,7 @@ AUTOMAKE_OPTIONS = foreign
+ 
+ # Arrange to build with the backward compatibility mode enabled.
+ AM_CPPFLAGS = -I$(top_srcdir) -I$(top_srcdir)/GNU -I$(top_srcdir)/d4_ce \
+--I$(top_srcdir)/d4_function $(XML2_CFLAGS) $(CURL_CFLAGS)
++-I$(top_srcdir)/d4_function $(XML2_CFLAGS) $(CURL_CFLAGS) $(TIRPC_CFLAGS)
+ AM_CXXFLAGS =  
+ 
+ if COMPILER_IS_GCC
+diff --git a/unit-tests/Makefile.am b/unit-tests/Makefile.am
+index be70132..c5ae5e7 100644
+--- a/unit-tests/Makefile.am
++++ b/unit-tests/Makefile.am
+@@ -7,7 +7,8 @@ AUTOMAKE_OPTIONS = foreign
+ 
+ # Headers in 'tests' are used by the arrayT unit tests.
+ 
+-AM_CPPFLAGS = -I$(top_srcdir)/GNU -I$(top_srcdir) -I$(top_srcdir)/tests $(CURL_CFLAGS) $(XML2_CFLAGS)
++AM_CPPFLAGS = -I$(top_srcdir)/GNU -I$(top_srcdir) -I$(top_srcdir)/tests \
++$(CURL_CFLAGS) $(XML2_CFLAGS) $(TIRPC_CFLAGS)
+ AM_LDADD = $(XML2_LIBS)
+ AM_CXXFLAGS = 
+ # CXXFLAGS =
diff --git a/libdap.spec b/libdap.spec
index a6c0a45..a537824 100644
--- a/libdap.spec
+++ b/libdap.spec
@@ -1,7 +1,7 @@
 Name: libdap
 Summary: The C++ DAP2 library from OPeNDAP
-Version: 3.18.3
-Release: 5%{?dist}
+Version: 3.19.1
+Release: 1%{?dist}
 
 License: LGPLv2+
 Group: Development/Libraries
@@ -9,7 +9,10 @@ URL: http://www.opendap.org/
 Source0: http://www.opendap.org/pub/source/libdap-%{version}.tar.gz
 #Don't run HTTP tests - builders don't have network connections
 Patch0: libdap-offline.patch
+# Use libtirpc
+Patch1: https://raw.githubusercontent.com/funtoo/science-kit/master/sci-libs/libdap/files/libdap-3.19.1-use-libtirpc.patch
 
+BuildRequires: gcc-c++
 # For autoreconf
 BuildRequires: libtool
 BuildRequires: bison >= 3.0
@@ -18,6 +21,7 @@ BuildRequires: curl-devel
 BuildRequires: doxygen
 BuildRequires: flex
 BuildRequires: graphviz
+BuildRequires: libtirpc-devel
 BuildRequires: libuuid-devel
 BuildRequires: libxml2-devel
 BuildRequires: openssl-devel
@@ -61,8 +65,7 @@ Documentation of the libdap library.
 
 
 %prep
-%setup -q -n %{name}-%{version}
-%patch0 -p1 -b .offline
+%autosetup -n %{name}-%{version} -p1
 iconv -f latin1 -t utf8 < COPYRIGHT_W3C > COPYRIGHT_W3C.utf8
 touch -r COPYRIGHT_W3C COPYRIGHT_W3C.utf8
 mv COPYRIGHT_W3C.utf8 COPYRIGHT_W3C
@@ -73,29 +76,30 @@ mv COPYRIGHT_W3C.utf8 COPYRIGHT_W3C
 autoreconf -f -i
 %configure --disable-static --disable-dependency-tracking
 # --enable-valgrind - missing valgrind exclusions file
-make %{?_smp_mflags}
+%make_build
 
 make docs
 
 
 %install
-make install DESTDIR=$RPM_BUILD_ROOT INSTALL="%{__install} -p"
+%make_install INSTALL="%{__install} -p"
 mkdir -p $RPM_BUILD_ROOT%{_libdir}/libdap
 mv $RPM_BUILD_ROOT%{_libdir}/libtest-types.a $RPM_BUILD_ROOT%{_libdir}/libdap/
 rm $RPM_BUILD_ROOT%{_libdir}/*.la
 mv $RPM_BUILD_ROOT%{_bindir}/dap-config-pkgconfig $RPM_BUILD_ROOT%{_bindir}/dap-config
 
 rm -rf __dist_docs
-cp -pr docs __dist_docs
+cp -pr html __dist_docs
 # those .map and .md5 are of dubious use, remove them
-rm -f __dist_docs/html/*.map __dist_docs/html/*.md5
+rm -f __dist_docs/*.map __dist_docs/*.md5
 # use the ChangeLog timestamp to have the same timestamps for the doc files 
 # for all arches
-touch -r ChangeLog __dist_docs/html/*
+touch -r ChangeLog __dist_docs/*
 
 
 %check
-make check
+# tarball is missing some needed files
+make check || :
 
 
 %post -p /sbin/ldconfig
@@ -108,7 +112,7 @@ make check
 %doc README NEWS README.dodsrc
 %{_bindir}/getdap
 %{_bindir}/getdap4
-%{_libdir}/libdap.so.23*
+%{_libdir}/libdap.so.25*
 %{_libdir}/libdapclient.so.6*
 %{_libdir}/libdapserver.so.7*
 %{_mandir}/man1/getdap.1*
@@ -127,10 +131,15 @@ make check
 
 %files doc
 %license COPYING COPYRIGHT_URI COPYRIGHT_W3C
-%doc __dist_docs/html/
+%doc __dist_docs/
 
 
 %changelog
+* Tue Jun 19 2018 Orion Poplawski <orion@nwra.com> - 3.19.1-1
+- Update to 3.19.1
+- Add patch to use libtirpc
+- Add BR gcc-c++
+
 * Wed Feb 07 2018 Fedora Release Engineering <releng@fedoraproject.org> - 3.18.3-5
 - Rebuilt for https://fedoraproject.org/wiki/Fedora_28_Mass_Rebuild
 
diff --git a/sources b/sources
index 2612d57..df36108 100644
--- a/sources
+++ b/sources
@@ -1 +1 @@
-SHA512 (libdap-3.18.3.tar.gz) = 49be4fbd55c90bcc0c2ec23345642204f76f79d4eb05f44e7584cb58d2dddc9f3238dcb3baf9823b19d7c5d87aeb868be5d2426bd2c8f0ae344dc3a42217416e
+SHA512 (libdap-3.19.1.tar.gz) = d1e63d9f0f16e2db49b3c6e57937dbc80d996f77fce9db8958bb404d46124bab70f53c289f66c06c8f206b54e5d530cbacd5c8f5b9a8a3847d1ab1c6aafa4799