Hi,

this just adds --std=gnu++17 to fix the build against newer poppler
versions.

To be committed together with the poppler update.

Ciao,
        Kili

Index: Makefile
===================================================================
RCS file: /cvs/ports/graphics/pdf2djvu/Makefile,v
retrieving revision 1.46
diff -u -p -r1.46 Makefile
--- Makefile    5 Dec 2022 09:10:12 -0000       1.46
+++ Makefile    16 Jul 2023 21:55:41 -0000
@@ -2,6 +2,7 @@ COMMENT =               creates DjVu files from PDF f
 
 V =                    0.9.19
 DISTNAME =             pdf2djvu-${V}
+REVISION =             0
 
 CATEGORIES =           graphics
 
@@ -43,6 +44,7 @@ CONFIGURE_ARGS +=     --disable-openmp \
                        --disable-rpath \
                        --without-pstreams
 CONFIGURE_ENV =                LDFLAGS="-L${LOCALBASE}/lib -L${X11BASE}/lib" \
-                       CPPFLAGS="-I${LOCALBASE}/include -I${X11BASE}/include"
+                       CPPFLAGS="-I${LOCALBASE}/include -I${X11BASE}/include" \
+                       CXXFLAGS="-std=gnu++17"
 
 .include <bsd.port.mk>

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