--- Makefile.orig	2025-07-10 05:25:44 UTC
+++ Makefile
@@ -1,6 +1,7 @@
 #  fotocx Makefile
 #
 #  Following commands choose compiler and debug options
+ifdef WANT_EXTRA_CXXFLAGS
 #  export CXX=g++          gnu compiler
 #  export CXX=clang++      clang compiler
 #  export DEBUG=x          debug build with address checking
@@ -27,6 +28,7 @@ else                                                  
                   -Wno-format-truncation -Wno-stringop-truncation
    endif
 endif
+endif
 
 PKG_CONFIG ?= pkg-config
 
@@ -34,7 +36,7 @@ CFLAGS = $(CXXFLAGS) $(CPPFLAGS) -c                   
          `$(PKG_CONFIG) --cflags gtk+-3.0 --cflags champlain-gtk-0.12`
 
 LIBS = `$(PKG_CONFIG) --libs gtk+-3.0`                                           \
-         -lrt -lpthread -ltiff -lpng -ljpeg                                      \
+         -lrt -lpthread -ltiff -lpng -ljpeg -lexecinfo \
          -lclutter-1.0 -lclutter-gtk-1.0                                         \
          -lchamplain-0.12 -lchamplain-gtk-0.12