diff --git a/oscar/oscar.pro b/oscar/oscar.pro
index 0f01e066..1675d00b 100644
--- a/oscar/oscar.pro
+++ b/oscar/oscar.pro
@@ -561,6 +561,9 @@ gcc:!clang {
     #}
 }
 
+# Ignore ODR-violations until fixed in upstream: https://gitlab.com/pholy/OSCAR-code/-/issues/87
+QMAKE_CXXFLAGS += -Wno-error=odr
+
 clang {
     message("Building for $$QMAKE_HOST.os")
     # this section removedi. all deprecated-copy  errors have been removed