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diff --git a/tools/jam/src/build.jam b/tools/jam/src/build.jam
index e30e854..7b397a3 100644
--- a/tools/jam/src/build.jam
+++ b/tools/jam/src/build.jam
@@ -2,6 +2,20 @@
#~ Distributed under the Boost Software License, Version 1.0.
#~ (See accompanying file LICENSE_1_0.txt or http://www.boost.org/LICENSE_1_0.txt)
+# Clean env vars of any "extra" empty values.
+for local v in ARGV CC CFLAGS
+{
+ local values ;
+ for local x in $($(v))
+ {
+ if $(x) != ""
+ {
+ values += $(x) ;
+ }
+ }
+ $(v) = $(values) ;
+}
+
# Platform related specifics.
if $(NT) { rule .path { return "$(<:J=\\)" ; } ./ = "/" ; }
else if $(OS2) { rule .path { return "$(<:J=\\)" ; } ./ = "/" ; }
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