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-rw-r--r--libraries/cfitsio/README7
1 files changed, 7 insertions, 0 deletions
diff --git a/libraries/cfitsio/README b/libraries/cfitsio/README
index f17c2e788a..b065ce914d 100644
--- a/libraries/cfitsio/README
+++ b/libraries/cfitsio/README
@@ -4,3 +4,10 @@ is also included for the convenience of Fortran programmers.
The documentation directory contains a comprehensive API reference
guide and instructions on using cfistio in Fortran programs.
+
+If you wish to build the library with the --enable-reentrant option,
+run the SlackBuild script like this:
+ REENTRANT=yes ./cfitsio.SlackBuild
+
+This option is disabled by default because some legacy software will
+not link against reentrant libcfitsio.