在安装mpfr时出现以下毛病：
-bash: ./mpfr⑶.1.2/make: No such file or directory
[root@localhost opt]# ./mpfr⑶.1.2/make
-bash: ./mpfr-3.1.2/make: No such file or directory
[root@localhost opt]# /opt/mpfr⑶.1.2/make
-bash: /opt/mpfr-3.1.2/make: No such file or directory
[root@localhost opt]# ../mpfr⑶.1.2/make
-bash: ../mpfr-3.1.2/make: No such file or directory
[root@localhost opt]# mpfr⑶.1.2/make
-bash: mpfr-3.1.2/make: No such file or directory
[root@localhost opt]# mpfr⑶.1.2/configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
configure: error: source directory already configured; run "make distclean" there first
[root@localhost opt]# ./mpfr⑶.1.2/configure
checking for a BSD-compatible install... /usr/bin/install -c
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... /bin/mkdir -p
checking for gawk... gawk
checking whether make sets $(MAKE)... yes
configure: error: source directory already configured; run "make distclean" there first
[root@localhost opt]# 注意：
configure可 以像下面这样履行：
mpfr⑶.1.2/configure
或：
./mpfr⑶.1.2/configure
但是make和make install 就不能像下面这样履行：
mpfr⑶.1.2/make
或：
./mpfr⑶.1.2/make
mpfr⑶.1.2/make install
或：
./mpfr⑶.1.2/make install
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