Mine

make -C mpg123-0.59r linux
make[1]: Entering directory `/usr/local/src/asterisk-1.2.12/mpg123-0.59r'
make CC=gcc LDFLAGS= \
                OBJECTS='decode_i386.o dct64_i386.o decode_i586.o \
                        audio_oss.o term.o' \
                CFLAGS='-DI386_ASSEM -DPENTIUM_OPT -DREAL_IS_FLOAT -DLINUX \
                        -DREAD_MMAP -DOSS -DTERM_CONTROL\
                        -Wall -O2 -m486 \
                        -fomit-frame-pointer -funroll-all-loops \
                        -finline-functions -ffast-math' \
                mpg123-make
make[2]: Entering directory `/usr/local/src/asterisk-1.2.12/mpg123-0.59r'
make[3]: Entering directory `/usr/local/src/asterisk-1.2.12/mpg123-0.59r'
gcc -DI386_ASSEM -DPENTIUM_OPT -DREAL_IS_FLOAT -DLINUX \
        -DREAD_MMAP -DOSS -DTERM_CONTROL\
        -Wall -O2 -m486 \
        -fomit-frame-pointer -funroll-all-loops \
        -finline-functions -ffast-math   -c -o mpg123.o mpg123.c
<command line>:1:13: warning: missing whitespace after the macro name
mpg123.c:480: warning: initialization makes integer from pointer without a cast
gcc -DI386_ASSEM -DPENTIUM_OPT -DREAL_IS_FLOAT -DLINUX \
        -DREAD_MMAP -DOSS -DTERM_CONTROL\
        -Wall -O2 -m486 \
        -fomit-frame-pointer -funroll-all-loops \
        -finline-functions -ffast-math   -c -o common.o common.c
<command line>:1:13: warning: missing whitespace after the macro name
gcc -DI386_ASSEM -DPENTIUM_OPT -DREAL_IS_FLOAT -DLINUX \
        -DREAD_MMAP -DOSS -DTERM_CONTROL\
        -Wall -O2 -m486 \
        -fomit-frame-pointer -funroll-all-loops \
        -finline-functions -ffast-math   -c -o decode_i386.o decode_i386.c
<command line>:1:13: warning: missing whitespace after the macro name
gcc -DI386_ASSEM -DPENTIUM_OPT -DREAL_IS_FLOAT -DLINUX \
        -DREAD_MMAP -DOSS -DTERM_CONTROL\
        -Wall -O2 -m486 \
        -fomit-frame-pointer -funroll-all-loops \
        -finline-functions -ffast-math   -c -o dct64_i386.o dct64_i386.c
<command line>:1:13: warning: missing whitespace after the macro name
as   -o decode_i586.o decode_i586.s
make[3]: *** No rule to make target `\
', needed by `mpg123'.  Stop.
make[3]: Leaving directory `/usr/local/src/asterisk-1.2.12/mpg123-0.59r'
make[2]: *** [mpg123-make] Error 2
make[2]: Leaving directory `/usr/local/src/asterisk-1.2.12/mpg123-0.59r'
make[1]: *** [linux] Error 2
make[1]: Leaving directory `/usr/local/src/asterisk-1.2.12/mpg123-0.59r'
make: *** [mpg123] Error 2