Fix for "matrix_complex.c:1525: error: conflicting types for ‘gsl_matrix_complex_equal’"

rb-gsl.patch

diff --git a/ext/matrix_complex.c b/ext/matrix_complex.c
index 8a77ac1..1b1d8af 100644
--- a/ext/matrix_complex.c
+++ b/ext/matrix_complex.c
@@ -1519,8 +1519,7 @@ static VALUE rb_gsl_matrix_complex_indgen_singleton(int argc, VALUE *argv, VALUE
   return Data_Wrap_Struct(cgsl_matrix_complex, 0, gsl_matrix_complex_free, mnew);
 }
 
-
-static int gsl_matrix_complex_equal(const gsl_matrix_complex *m1,
+static int gsl_matrix_complex_equal_witg_eps(const gsl_matrix_complex *m1,
   const gsl_matrix_complex *m2, double eps)
 {
   gsl_complex z1, z2;
@@ -1537,6 +1536,7 @@ static int gsl_matrix_complex_equal(const gsl_matrix_complex *m1,
   return 1;
 }
 
+
 static VALUE rb_gsl_matrix_complex_equal(int argc, VALUE *argv, VALUE obj)
 {
   gsl_matrix_complex *m1, *m2;
@@ -1555,7 +1555,7 @@ static VALUE rb_gsl_matrix_complex_equal(int argc, VALUE *argv, VALUE obj)
   Data_Get_Struct(obj, gsl_matrix_complex, m1);
   CHECK_MATRIX_COMPLEX(argv[0]);
   Data_Get_Struct(argv[0], gsl_matrix_complex, m2);
-  ret = gsl_matrix_complex_equal(m1, m2, eps);
+  ret = gsl_matrix_complex_equal_witg_eps(m1, m2, eps);
   if (ret == 1) return Qtrue;
   else return Qfalse;
 }
diff --git a/ext/vector_complex.c b/ext/vector_complex.c
index f9a84f0..2711a36 100644
--- a/ext/vector_complex.c
+++ b/ext/vector_complex.c
@@ -1986,7 +1986,7 @@ static VALUE rb_gsl_vector_complex_zip(int argc, VALUE *argv, VALUE obj)
   return ary;
 }
 
-static int gsl_vector_complex_equal(const gsl_vector_complex *v1,
+static int gsl_vector_complex_equal_with_eps(const gsl_vector_complex *v1,
   const gsl_vector_complex *v2, double eps)
 {
   gsl_complex z1, z2;
@@ -2019,7 +2019,7 @@ static VALUE rb_gsl_vector_complex_equal(int argc, VALUE *argv, VALUE obj)
   Data_Get_Struct(obj, gsl_vector_complex, v1);
   CHECK_VECTOR_COMPLEX(argv[0]);
   Data_Get_Struct(argv[0], gsl_vector_complex, v2);
-  ret = gsl_vector_complex_equal(v1, v2, eps);
+  ret = gsl_vector_complex_equal_with_eps(v1, v2, eps);
   if (ret == 1) return Qtrue;
   else return Qfalse;
 }

Please note anybody struggling with this can install from 30robots repo at:
https://github.com/30robots/rb-gsl

Also, my repo has a fix for the deprecated Gem#searcher method
https://github.com/whistlerbrk/rb-gsl

and a pull request has been sent to 30robots.