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+configure script --extra-cflags not passed to config-meson.cross
+
+Since qemu 5.2, when building, the configure would not finish, but would return this error instead:
+
+   qemu ../meson.build:852:2: ERROR: C header 'sasl/sasl.h' not found
+
+This is for a cross build, and I invoke qemu with the --extra-cflags and --extra-ldflags containing all the proper paths to the headers, libraries etc. It worked properly with qemu 3.1 to 5.1.
+
+After looking into the configure script, it seems that meson is passed the CFLAGS environment variable instead of QEMU_CFLAGS, and only the latter contains the --extra-cflags argument:
+
+    echo "c_args = [${CFLAGS:+$(meson_quote $CFLAGS)}]" >> $cross
+
+Using the CFLAGS and LDFLAGS environment variable instead of --extra-cflags and --extra-ldflags fixes the issue.
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