Hello, I am trying to run the GNU Scientific Libraries on a M1 MacBook, using the Eclipse IDE. The source code is minimal: #include <stdio.h> #include <stdlib.h> #include <gsl/gsl_sf_bessel.h> int main(void) { puts("Simple GSL Test"); double x = 5.0; double y = gsl_sf_bessel_J0 (x); printf ("J0(%g) = %.18e\n", x, y); return EXIT_SUCCESS; } Linking runs without warnings: 17:02:47 **** Incremental Build of configuration Debug for project TestGSL **** make all Building file: ../src/TestGSL.c Invoking: GCC C Compiler gcc -I/opt/homebrew/Cellar/gsl/2.7.1/include -O0 -g3 -Wall -c -fmessage-length=0 -MMD -MP -MF"src/TestGSL.d" -MT"src/TestGSL.o" -o "src/TestGSL.o" "../src/TestGSL.c" Finished building: ../src/TestGSL.c Building target: TestGSL Invoking: MacOS X C Linker gcc -L/opt/homebrew/lib/ -L/opt/homebrew/Cellar/gsl/2.7.1/lib -o "TestGSL" ./src/TestGSL.o -lgsl Finished building target: TestGSL 17:02:47 Build Finished. 0 errors, 0 warnings. (took 516ms) Running gives the following error: dyld[34729]: symbol not found in flat namespace (_cblas_caxpy) I was unable to find the proper solution. Does someone know how to fix it ? Many thanks, Luca