--- Makefile.orig	2023-01-31 21:43:57 UTC
+++ Makefile
@@ -1,5 +1,6 @@
 #  fotoxx Makefile
 #
+ifdef WANT_EXTRA_CXXFLAGS
 #  export CXX=g++          gnu compiler
 #  export CXX=clang++      clang compiler
 #  export DEBUG=x          debug build with address checking
@@ -28,6 +29,7 @@ else                       #  GCC
       CXXFLAGS += -Wall -g2 -rdynamic -O2 -Wno-format-truncation -Wno-stringop-truncation
    endif
 endif
+endif
 
 PKG_CONFIG ?= pkg-config
 
@@ -35,7 +37,7 @@ CFLAGS = $(CXXFLAGS) $(CPPFLAGS) -c                   
          `$(PKG_CONFIG) --cflags gtk+-3.0 --libs champlain-gtk-0.12`
 
 LIBS = `$(PKG_CONFIG) --libs gtk+-3.0`                                              \
-         -lrt -lpthread -llcms2 -ltiff -lpng -ljpeg                                 \
+         -lrt -lpthread -llcms2 -ltiff -lpng -ljpeg -lexecinfo \
          -lclutter-1.0 -lclutter-gtk-1.0 -lchamplain-0.12 -lchamplain-gtk-0.12
 
 ALLFILES = fotoxx.o f.widgets.o f.file.o f.gallery.o f.albums.o f.select.o f.meta.o    \
