build failure

[Leo Liu]

Build failed on Centos 7:

........
/bin/sh ../libtool  --tag=CC   --mode=link gcc  -g -O2   -o global global.o 
literal.o output.o convert.o ../libparser/libgloparser.a 
../libutil/libgloutil.a ../libdb/libglodb.a ../libglibc/libgloglibc.a -lltdl 
-ldl 
libtool: link: gcc -g -O2 -o global global.o literal.o output.o convert.o  
../libparser/libgloparser.a ../libutil/libgloutil.a ../libdb/libglodb.a 
../libglibc/libgloglibc.a -lltdl -ldl
../libglibc/libgloglibc.a(sqlite3.o): In function `pthreadMutexTry':
/home/ebrew/sources/global/libglibc/sqlite3.c:19185: undefined reference to 
`pthread_mutex_trylock'
../libglibc/libgloglibc.a(sqlite3.o): In function `sqlite3ThreadCreate':
/home/ebrew/sources/global/libglibc/sqlite3.c:22061: undefined reference to 
`pthread_create'
../libglibc/libgloglibc.a(sqlite3.o): In function `pthreadMutexAlloc':
/home/ebrew/sources/global/libglibc/sqlite3.c:19053: undefined reference to 
`pthread_mutexattr_init'
/home/ebrew/sources/global/libglibc/sqlite3.c:19054: undefined reference to 
`pthread_mutexattr_settype'
/home/ebrew/sources/global/libglibc/sqlite3.c:19056: undefined reference to 
`pthread_mutexattr_destroy'
../libglibc/libgloglibc.a(sqlite3.o): In function `sqlite3ThreadJoin':
/home/ebrew/sources/global/libglibc/sqlite3.c:22081: undefined reference to 
`pthread_join'
collect2: error: ld returned 1 exit status
make[2]: *** [global] Error 1
make[2]: Leaving directory `/home/ebrew/sources/global/global'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/ebrew/sources/global'
make: *** [all] Error 2