error: 'LDBL_MIN_EXP' undeclared

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Hello,

I am building a cross compiler (linux 32 bits -> windows 32 bits).
I have compiled:
- binutils-2.22
- gcc-4.8.0
- w32api library

But when I try to compile mingwrt library, I got an error:
$ make
Making `all' in `mingwex'
make[1]: Entering directory `/home/yugiohjcj/documents/downloads/software/mingwrt-3.20-2-mingw32/mingwex'
i686-pc-mingw32-gcc -c  -g -O2   -Wall -fomit-frame-pointer -I. -I.. -I../include -nostdinc -iwithprefixbefore include -I ../../w32api/include ./math/hypotl.c -o hypotl.o
./math/hypotl.c: In function 'hypotl':
./math/hypotl.c:63:15: error: 'LDBL_MAX_EXP' undeclared (first use in this function)
     if (exx > LDBL_MAX_EXP)
               ^
./math/hypotl.c:63:15: note: each undeclared identifier is reported only once for each function it appears in
./math/hypotl.c:68:13: error: 'LDBL_MIN_EXP' undeclared (first use in this function)
   if (exx < LDBL_MIN_EXP)
             ^
make[1]: *** [hypotl.o] Error 1
make[1]: Leaving directory `/home/yugiohjcj/documents/downloads/software/mingwrt-3.20-2-mingw32/mingwex'
make: *** [mingwex] Error 2

What is this undeclared LDBL_MIN_EXP element?

Thank you.
Best regards.




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