> In between the upgrade to 2.10.1 did you change anything like the gcc
> version?

No

> #define __LINBOX_CONFIGURATION
> #include "linbox/config-blas.h"
> int main ()
> {
>  double a;
>  return 0;
>
> }
>
> If that work we have a problem somewhere, if it doesn't work something
> it wrong with your toolchain and/or your ATLAS install.

It compiles only if I do the following:

sage -sh
g++ -o test -I$SAGE_LOCAL/include -D__LINBOX_HAVE_CBLAS  conftest.cpp

Without the LINBOX_HAVE_CBLAS I get a lot of errors such as:
/tmp/ccMY0e0Z.o: In function `cblas_sgemm':
conftest.cpp:(.text+0x1dd): undefined reference to `sgemm_'
conftest.cpp:(.text+0x257): undefined reference to `sgemm_'

Phil

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