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Asked: 2026-05-23T06:46:11+00:00

Problem solved by Shawn Chin in Answer 1 . And what drives me crazy

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Problem solved by Shawn Chin in Answer 1. And what drives me crazy is that to compile mcrypt extension, only libmcrypt is enough, there is no need to compile mhash and mcrypt 🙁

I want to compile mcrypt extension for php (RHEL5.1, Intel i5 650), here is my procedure 

# libmcrypt
tar zxf libmcrypt-2.5.8.tar.gz
cd libmcrypt-2.5.8
./configure --prefix=/home/felix021/lamp/libmcrypt/
make
make install

# mhash
tar jxf mhash-0.9.9.9.tar.bz2
cd mhash-0.9.9.9
./configure --prefix=/home/felix021/lamp/mhash/
make
make install 

# mcrypt
LD_LIBRARY_PATH=/home/felix021/lamp/libmcrypt/lib:/home/felix021/lamp/mhash/lib
./configure --prefix=/home/felix021/lamp/mcrypt/ \
    --with-libmcrypt-prefix=/home/felix021/lamp/libmcrypt

configure failed with notice：

checking for mhash_keygen in -lmhash... no
configure: error: "You need at least libmhash 0.8.15 to compile this program. \
http://mhash.sf.net/"

So I downloaded mhash0.8.18 and mhash0.8.15, but the same error occurred.

I looked up “mhash_keygen” in 0.8.15/8:

int mhash_keygen(xxx,xxx,xxx)

And it’s in 0.9.9.9:

#if defined(PROTOTYPES)
mutils_error mhash_keygen(keygenid algorithm, ....)
#else
mutils_error mhash_keygen();
#endif
//typedef uint32 mutils_error

But, mcrypt-2.6.8/configure +12114, it’s: 

char mhash_keygen ();

I changed “char” to “mutils_error” in configure, the error still appears.

What can I do more….?

Thanks for reading my loooooooong question.

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1 Answer

  1. Editorial Team

    I’ve retraced your steps on an RHEL5 box, and did get the same error.

    From at config.log, it looks like the libmhash could not be located.

    configure:12093: checking for mhash_keygen in -lmhash
configure:12128: gcc -o conftest -g -O2   conftest.c -lmhash   >&5
/usr/bin/ld: cannot find -lmhash
collect2: ld returned 1 exit status

    There ought to be a cleaner way to do it, but I managed to get mcrypt configured and compiled by providing the lib and include directories for mhash via additional CFLAGS and LDFLAGS.

    # mcrypt
export LD_LIBRARY_PATH=/home/felix021/lamp/libmcrypt/lib:/home/felix021/lamp/mhash/lib
export LDFLAGS="-L/home/felix021/lamp/mhash/lib/ -I/home/felix021/lamp/mhash/include/"
export CFLAGS="-I/home/felix021/lamp/mhash/include/"
./configure --prefix=/home/felix021/lamp/mcrypt/ \
    --with-libmcrypt-prefix=/home/felix021/lamp/libmcrypt
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