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-rw-r--r--gnu/packages/compression.scm2
1 files changed, 2 insertions, 0 deletions
diff --git a/gnu/packages/compression.scm b/gnu/packages/compression.scm
index 506a33184a..9c9c30ec56 100644
--- a/gnu/packages/compression.scm
+++ b/gnu/packages/compression.scm
@@ -804,6 +804,8 @@ decompression of some loosely related file formats used by Microsoft.")
     (arguments
      `(#:test-target "test"
        #:make-flags (list "CC=gcc"
+                          "CFLAGS=-g -O2 -D_FILE_OFFSET_BITS=64"
+                          "CXXFLAGS=-g -O2 -D_FILE_OFFSET_BITS=64"
                           (string-append "prefix=" (assoc-ref %outputs "out")))
        #:phases (modify-phases %standard-phases
                   (delete 'configure)            ;no configure script