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-rw-r--r--mk/flavours/devel2.mk4
1 files changed, 4 insertions, 0 deletions
diff --git a/mk/flavours/devel2.mk b/mk/flavours/devel2.mk
index 1c8e24f745..2d7d3b3884 100644
--- a/mk/flavours/devel2.mk
+++ b/mk/flavours/devel2.mk
@@ -10,3 +10,7 @@ BUILD_SPHINX_PDF = NO
BUILD_MAN = NO
LAX_DEPENDENCIES = YES
+
+# Reduce optimisation when building Cabal; this makes a significant difference
+# in overall build time. See #16817.
+libraries/Cabal_dist-install_HC_OPTS += -O0