Hai manal, Did you provide the option -lm while compiling your code. With regards, Anandkumar.C.B -----Original Message----- From: gcc-help-owner@xxxxxxxxxxx [mailto:gcc-help-owner@xxxxxxxxxxx] On Behalf Of Manal Helal Sent: Tuesday, November 18, 2008 4:37 PM To: gcc-help@xxxxxxxxxxx Subject: long math functions on cygwin Hello I am trying to compile some unix code on cygwin, using gcc version: ***************************************** Reading specs from /usr/lib/gcc/i686-pc-cygwin/3.4.4/specs Configured with: /usr/build/package/orig/test.respin/gcc-3.4.4-3/configure --ver bose --prefix=/usr --exec-prefix=/usr --sysconfdir=/etc --libdir=/usr/lib --libe xecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --enable-langu ages=c,ada,c++,d,f77,pascal,java,objc --enable-nls --without-included-gettext -- enable-version-specific-runtime-libs --without-x --enable-libgcj --disable-java- awt --with-system-zlib --enable-interpreter --disable-libgcj-debug --enable-thre ads=posix --enable-java-gc=boehm --disable-win32-registry --enable-sjlj-exceptio ns --enable-hash-synchronization --enable-libstdcxx-debug Thread model: posix gcc version 3.4.4 (cygming special, gdc 0.12, using dmd 0.125) ***************************************** and I get these errors: ***************************************** /home/user/proj/main.c:907: undefined reference to `_sqrtl' /home/user/proj/main.c:1743: undefined reference to `_powl' /home/user/proj/main.c:2006: undefined reference to `_ceill' /home/user/proj/main.c:2035: undefined reference to `_floorl' ***************************************** Can you please help me find what is missing? thank you very much, Kind Regards, manal Important notice:This e-mail and any attachment thereto contains corporate proprietary information. If you have received it by mistake, please notify us immediately by reply e-mail and delete this e-mail and its attachments from your system. Thank You.