The detection failure is due to the following program run by configure
(from m4/cpl.m4):
--------------------------8<------------------------------------
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fftw3.h>
int main(void) {
char vmin[] = "3.1.2";
char *vstr = strdup(fftw_version);
char *vlib = vstr;
char *suffix = NULL;
int min_major = 0;
int min_minor = 0;
int min_micro = 0;
int lib_major = 0;
int lib_minor = 0;
int lib_micro = 0;
vlib = strchr(vstr, '-') + 1;
suffix = strrchr(vlib, '-');
if (suffix) {
*suffix = '\0';
}
sscanf(vmin, "%d.%d.%d", &min_major, &min_minor, &min_micro);
sscanf(vlib, "%d.%d.%d", &lib_major, &lib_minor, &lib_micro);
FILE* f = fopen("conftest.out", "w");
fprintf(f, "%s\n", vlib);
fclose(f);
free(vstr);
if (lib_major < min_major) {
return 1;
} else {
if (lib_major == min_major) {
if (lib_minor < min_minor) {
return 1;
} else {
if (lib_minor == min_minor) {
if (lib_micro < min_micro) {
return 1;
}
}
}
}
}
return 0;
}
--------------------------8<------------------------------------
Since the output prints with the version number "4.13.4" the wcslib
version number, I suspect that the program is actually run on these
platform -- either it silently crashes, or it does not compile at all.
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