#374 removed HAVE_LIBDXFLIB from config.h.in and config/CMakeLists.txt since dxflib is now always bundled, but the C source still guards DXF UI/CLI code behind #ifdef HAVE_LIBDXFLIB / #if HAVE_LIBDXFLIB (12 occurrences):

• callbacks.c: lines 660, 836
• main.c: lines 514, 527, 540, 1203, 1237, 1500, 1517
• interface.c: lines 185, 448, 1379

Since the macro is never defined, DXF export menu items, file-save-as options, and CLI flags are compiled out. export-dxf.cpp is linked into libgerbv but the application never calls it.

Fix: remove the 12 guards and their #endif counterparts, since dxflib is now unconditionally available.