vcpkg/ports/gsl/0001-configure.patch

---
diff --git a/config.h.in b/config.h
index adab7a58d..f6dc2278e 100644
--- a/config.h.in
+++ b/config.h
@@ -11,19 +11,19 @@
 
 /* Define to 1 if you have the declaration of `acosh', and to 0 if you don't.
    */
-#undef HAVE_DECL_ACOSH
+#define HAVE_DECL_ACOSH 1
 
 /* Define to 1 if you have the declaration of `asinh', and to 0 if you don't.
    */
-#undef HAVE_DECL_ASINH
+#define HAVE_DECL_ASINH 1
 
 /* Define to 1 if you have the declaration of `atanh', and to 0 if you don't.
    */
-#undef HAVE_DECL_ATANH
+#define HAVE_DECL_ATANH 1
 
 /* Define to 1 if you have the declaration of `expm1', and to 0 if you don't.
    */
-#undef HAVE_DECL_EXPM1
+#define HAVE_DECL_EXPM1 1
 
 /* Define to 1 if you have the declaration of `feenableexcept', and to 0 if
    you don't. */
@@ -43,31 +43,31 @@
 
 /* Define to 1 if you have the declaration of `frexp', and to 0 if you don't.
    */
-#undef HAVE_DECL_FREXP
+#define HAVE_DECL_FREXP 1
 
 /* Define to 1 if you have the declaration of `hypot', and to 0 if you don't.
    */
-#undef HAVE_DECL_HYPOT
+#define HAVE_DECL_HYPOT 1
 
 /* Define to 1 if you have the declaration of `isfinite', and to 0 if you
    don't. */
-#undef HAVE_DECL_ISFINITE
+#define HAVE_DECL_ISFINITE 1
 
 /* Define to 1 if you have the declaration of `isinf', and to 0 if you don't.
    */
-#undef HAVE_DECL_ISINF
+#define HAVE_DECL_ISINF 1
 
 /* Define to 1 if you have the declaration of `isnan', and to 0 if you don't.
    */
-#undef HAVE_DECL_ISNAN
+#define HAVE_DECL_ISNAN 1
 
 /* Define to 1 if you have the declaration of `ldexp', and to 0 if you don't.
    */
-#undef HAVE_DECL_LDEXP
+#define HAVE_DECL_LDEXP 1
 
 /* Define to 1 if you have the declaration of `log1p', and to 0 if you don't.
    */
-#undef HAVE_DECL_LOG1P
+#define HAVE_DECL_LOG1P 1
 
 /* Define to 1 if you have the <dlfcn.h> header file. */
 #undef HAVE_DLFCN_H
@@ -76,13 +76,13 @@
 #undef HAVE_DOPRNT
 
 /* Defined if you have ansi EXIT_SUCCESS and EXIT_FAILURE in stdlib.h */
-#undef HAVE_EXIT_SUCCESS_AND_FAILURE
+#define HAVE_EXIT_SUCCESS_AND_FAILURE 1
 
 /* Defined on architectures with excess floating-point precision */
 #undef HAVE_EXTENDED_PRECISION_REGISTERS
 
 /* Define if x86 processor has sse extensions. */
-#undef HAVE_FPU_X86_SSE
+#define HAVE_FPU_X86_SSE 1
 
 /* Define to 1 if you have the <ieeefp.h> header file. */
 #undef HAVE_IEEEFP_H
@@ -97,43 +97,43 @@
 #undef HAVE_INLINE
 
 /* Define to 1 if you have the <inttypes.h> header file. */
-#undef HAVE_INTTYPES_H
+#define HAVE_INTTYPES_H 1
 
 /* Define to 1 if you have the `m' library (-lm). */
 #undef HAVE_LIBM
 
 /* Define to 1 if you have the `memcpy' function. */
-#undef HAVE_MEMCPY
+#define HAVE_MEMCPY 1
 
 /* Define to 1 if you have the `memmove' function. */
-#undef HAVE_MEMMOVE
+#define HAVE_MEMMOVE 1
 
 /* Define this if printf can handle %Lf for long double */
 #undef HAVE_PRINTF_LONGDOUBLE
 
 /* Define to 1 if you have the <stdint.h> header file. */
-#undef HAVE_STDINT_H
+#define HAVE_STDINT_H 1
 
 /* Define to 1 if you have the <stdio.h> header file. */
-#undef HAVE_STDIO_H
+#define HAVE_STDIO_H 1
 
 /* Define to 1 if you have the <stdlib.h> header file. */
-#undef HAVE_STDLIB_H
+#define HAVE_STDLIB_H 1
 
 /* Define to 1 if you have the `strdup' function. */
-#undef HAVE_STRDUP
+#define HAVE_STRDUP 1
 
 /* Define to 1 if you have the <strings.h> header file. */
 #undef HAVE_STRINGS_H
 
 /* Define to 1 if you have the <string.h> header file. */
-#undef HAVE_STRING_H
+#define HAVE_STRING_H 1
 
 /* Define to 1 if you have the `strtol' function. */
-#undef HAVE_STRTOL
+#define HAVE_STRTOL 1
 
 /* Define to 1 if you have the `strtoul' function. */
-#undef HAVE_STRTOUL
+#define HAVE_STRTOUL 1
 
 /* Define to 1 if you have the <sys/stat.h> header file. */
 #undef HAVE_SYS_STAT_H
@@ -145,7 +145,7 @@
 #undef HAVE_UNISTD_H
 
 /* Define to 1 if you have the `vprintf' function. */
-#undef HAVE_VPRINTF
+#define HAVE_VPRINTF 1
 
 /* Define if you need to hide the static definitions of inline functions */
 #undef HIDE_INLINE_STATIC
@@ -180,7 +180,7 @@
 /* Define to 1 if all of the C90 standard headers exist (not just the ones
    required in a freestanding environment). This macro is provided for
    backward compatibility; new code need not use it. */
-#undef STDC_HEADERS
+#define STDC_HEADERS 1
 
 /* Version number of package */
 #undef VERSION
---