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-rw-r--r--gnu/packages/engineering.scm3
1 files changed, 2 insertions, 1 deletions
diff --git a/gnu/packages/engineering.scm b/gnu/packages/engineering.scm
index 55af90bc82..5854249bb1 100644
--- a/gnu/packages/engineering.scm
+++ b/gnu/packages/engineering.scm
@@ -769,7 +769,8 @@ fonts to gEDA.")
              (lambda* (#:key inputs #:allow-other-keys)
                (setenv "CPLUS_INCLUDE_PATH"
                        (string-append (assoc-ref inputs "catch")
-                                      "/include/catch"))
+                                      "/include/catch:"
+                                      (or (getenv "CPLUS_INCLUDE_PATH") "")))
                #t)))))
       (native-inputs
        `(("pkg-config" ,pkg-config)))