[pg]: forced c++17

extensions/DBServer-PostgreSQL/Makefile.am

@@ -5,16 +5,16 @@ lib_LTLIBRARIES              = libUniSet2-pgsql.la
 libUniSet2_pgsql_la_LDFLAGS  = -version-info $(UPGSQL_VER)
 libUniSet2_pgsql_la_SOURCES  = PostgreSQLInterface.cc DBServer_PostgreSQL.cc
 libUniSet2_pgsql_la_LIBADD   = $(top_builddir)/lib/libUniSet2.la $(PGSQL_LIBS)
-libUniSet2_pgsql_la_CXXFLAGS = $(PGSQL_CFLAGS)
+libUniSet2_pgsql_la_CXXFLAGS = -std=c++17 $(PGSQL_CFLAGS)
 
 bin_PROGRAMS                      = @PACKAGE@-pgsql-dbserver
 @PACKAGE@_pgsql_dbserver_LDADD    = libUniSet2-pgsql.la $(top_builddir)/lib/libUniSet2.la $(PGSQL_LIBS)
-@PACKAGE@_pgsql_dbserver_CXXFLAGS = $(PGSQL_CFLAGS)
+@PACKAGE@_pgsql_dbserver_CXXFLAGS = -std=c++17 $(PGSQL_CFLAGS)
 @PACKAGE@_pgsql_dbserver_SOURCES  = main.cc
 
 noinst_PROGRAMS     = pgsql-test
 pgsql_test_LDADD    = libUniSet2-pgsql.la $(top_builddir)/lib/libUniSet2.la $(PGSQL_LIBS)
-pgsql_test_CXXFLAGS = $(PGSQL_CFLAGS)
+pgsql_test_CXXFLAGS = -std=c++17 $(PGSQL_CFLAGS)
 pgsql_test_SOURCES  = test.cc
 
 # install

extensions/DBServer-PostgreSQL/libUniSet2PostgreSQL.pc.in

@@ -8,4 +8,4 @@ Description: Support library for libUniSet2PostgreSQL
 Requires: libUniSet2 libpqxx
 Version: @VERSION@
 Libs: -L${libdir} -lUniSet2-pgsql
-Cflags: -I${includedir}/@PACKAGE@ -I${includedir}/@PACKAGE@/extensions/pgsql
+Cflags: -std=c++17 -I${includedir}/@PACKAGE@ -I${includedir}/@PACKAGE@/extensions/pgsql