AM_CONDITIONAL seems failure, help

[张亚霏]

hi all:

I write these lines in configure.in:

AC_CHECK_LIB([pcre], [pcre_compile],
[build_pcre=true],
[build_pcre=false])
AM_CONDITIONAL([BUILD_PCRE],[test "$build_pcre" = "true"])

AC_MSG_CHECKING(pcrecpp)
AC_COMPILE_IFELSE([
#include <pcrecpp.h>
],
[build_pcrecpp=true; AC_MSG_RESULT(yes)],
[build_pcrecpp=false; AC_MSG_RESULT(no)]
)
AM_CONDITIONAL([BUILD_PCRECPP],[test "$build_pcrecpp"="true"])


AC_CHECK_LIB([iconv], [libiconv_open],
[build_libiconv=yes],
[build_libiconv=no])
AM_CONDITIONAL([BUILD_LIBICONV],[test "$build_libiconv"="yes"])
...
AC_CONFIG_FILES([Makefile \
other/Makefile \
performance/Makefile \
posix/Makefile \
stdc/Makefile])
AC_OUTPUT


./configure outputs:
...
checking for pcre_compile in -lpcre... no
checking pcrecpp... no
checking for libiconv_open in -liconv... no
...


the content of other/Makefile:

bin_PROGRAMS =

if BUILD_PCRE
bin_PROGRAMS += pcre_test
pcre_test_LDADD = -lpcre
endif

if BUILD_PCRECPP
bin_PROGRAMS += pcrecpp_test
pcrecpp_test_SOURCES = pcrecpp_test.cpp
pcrecpp_test_LDADD = -lpcrecpp
endif

if BUILD_LIBICONV
bin_PROGRAMS += libiconv_test
libiconv_test_LDADD = -liconv
endif


When I make, pcre_test is not to be compiled, but pcrecpp_test and
libiconv_test are to be compiled, which generates compiling errors.

make -n outputs:
...
make[1]: Entering directory `/data1/ad_plus/kimizhang/kimi-tests/other'
if g++ -DHAVE_CONFIG_H -I. -I. -I../include    -g -Wall -Werror  -MT
pcrecpp_test.o -MD -MP -MF ".deps/pcrecpp_test.Tpo" -c -o pcrecpp_test.o
pcrecpp_test.cpp; \
then mv -f ".deps/pcrecpp_test.Tpo" ".deps/pcrecpp_test.Po"; else rm -f
".deps/pcrecpp_test.Tpo"; exit 1; fi
rm -f pcrecpp_test
g++ -g -Wall -Werror    -o pcrecpp_test  pcrecpp_test.o -lpcrecpp
if gcc -DHAVE_CONFIG_H -I. -I. -I../include    -g -Wall -Werror  -MT
libiconv_test.o -MD -MP -MF ".deps/libiconv_test.Tpo" -c -o libiconv_test.o
libiconv_test.c; \
then mv -f ".deps/libiconv_test.Tpo" ".deps/libiconv_test.Po"; else rm -f
".deps/libiconv_test.Tpo"; exit 1; fi
rm -f libiconv_test
gcc -g -Wall -Werror    -o libiconv_test  libiconv_test.o -liconv
make[1]: Leaving directory `/data1/ad_plus/kimizhang/kimi-tests/other'
...

my environment:
linux-suse-64
autoconf 2.63
automake 1.11

Help, thanks all!!!