configure: allow to disable libnss and libnspr

Let user chose to disable libnss and libnspr support even if these
libraries are installed in the system. Default remains to enable when
libraries are found and disable parameter were not used

configure.ac

@@ -1586,15 +1586,8 @@
     fi
 
   # libnspr
-    enable_nspr="no"
-
-    # Try pkg-config first:
-    PKG_CHECK_MODULES([libnspr], nspr,, [with_pkgconfig_nspr=no])
-    if test "$with_pkgconfig_nspr" != "no"; then
-        CPPFLAGS="${CPPFLAGS} ${libnspr_CFLAGS}"
-        LIBS="${LIBS} ${libnspr_LIBS}"
-    fi
-
+    AC_ARG_ENABLE(nspr,
+            AS_HELP_STRING([--disable-nspr],[Disable libnspr support]))
     AC_ARG_WITH(libnspr_includes,
             [  --with-libnspr-includes=DIR  libnspr include directory],
             [with_libnspr_includes="$withval"],[with_libnspr_includes=no])
@@ -1602,41 +1595,43 @@
             [  --with-libnspr-libraries=DIR    libnspr library directory],
             [with_libnspr_libraries="$withval"],[with_libnspr_libraries="no"])
 
-    if test "$with_libnspr_includes" != "no"; then
-        CPPFLAGS="${CPPFLAGS} -I${with_libnspr_includes}"
-    fi
+    if test "$enable_nspr" != "no"; then
+      # Try pkg-config first:
+      PKG_CHECK_MODULES([libnspr], nspr,, [with_pkgconfig_nspr=no])
+      if test "$with_pkgconfig_nspr" != "no"; then
+          CPPFLAGS="${CPPFLAGS} ${libnspr_CFLAGS}"
+          LIBS="${LIBS} ${libnspr_LIBS}"
+      fi
 
-    AC_CHECK_HEADER(nspr.h,NSPR="yes",NSPR="no")
-    if test "$NSPR" = "yes"; then
-        if test "$with_libnspr_libraries" != "no"; then
-            LDFLAGS="${LDFLAGS}  -L${with_libnspr_libraries}"
-        fi
+      if test "$with_libnspr_includes" != "no"; then
+          CPPFLAGS="${CPPFLAGS} -I${with_libnspr_includes}"
+      fi
 
-        AC_CHECK_LIB(nspr4, PR_GetCurrentThread,, NSPR="no")
+      AC_CHECK_HEADER(nspr.h,NSPR="yes",NSPR="no")
+      if test "$NSPR" = "yes"; then
+          if test "$with_libnspr_libraries" != "no"; then
+              LDFLAGS="${LDFLAGS}  -L${with_libnspr_libraries}"
+          fi
 
-        if test "$NSPR" = "no"; then
-            echo
-            echo "   ERROR!  libnspr library not found, go get it"
-            echo "   from Mozilla or your distribution:"
-            echo
-            echo "   Ubuntu: apt-get install libnspr4-dev"
-            echo "   Fedora: yum install nspr-devel"
-            echo
-            exit 1
-        fi
-        enable_nspr="yes"
+          AC_CHECK_LIB(nspr4, PR_GetCurrentThread,, NSPR="no")
+
+          if test "$NSPR" = "no"; then
+              echo
+              echo "   ERROR!  libnspr library not found, go get it"
+              echo "   from Mozilla or your distribution:"
+              echo
+              echo "   Ubuntu: apt-get install libnspr4-dev"
+              echo "   Fedora: yum install nspr-devel"
+              echo
+              exit 1
+          fi
+          enable_nspr="yes"
+      fi
     fi
 
   # libnss
-    enable_nss="no"
-
-    # Try pkg-config first:
-    PKG_CHECK_MODULES([libnss], nss,, [with_pkgconfig_nss=no])
-    if test "$with_pkgconfig_nss" != "no"; then
-        CPPFLAGS="${CPPFLAGS} ${libnss_CFLAGS}"
-        LIBS="${LIBS} ${libnss_LIBS}"
-    fi
-
+    AC_ARG_ENABLE(nss,
+            AS_HELP_STRING([--disable-nss],[Disable libnss support]))
     AC_ARG_WITH(libnss_includes,
             [  --with-libnss-includes=DIR  libnss include directory],
             [with_libnss_includes="$withval"],[with_libnss_includes=no])
@@ -1644,31 +1639,40 @@
             [  --with-libnss-libraries=DIR    libnss library directory],
             [with_libnss_libraries="$withval"],[with_libnss_libraries="no"])
 
-    if test "$with_libnss_includes" != "no"; then
-        CPPFLAGS="${CPPFLAGS} -I${with_libnss_includes}"
-    fi
+    if test "$enable_nss" != "no"; then
+      # Try pkg-config first:
+      PKG_CHECK_MODULES([libnss], nss,, [with_pkgconfig_nss=no])
+      if test "$with_pkgconfig_nss" != "no"; then
+          CPPFLAGS="${CPPFLAGS} ${libnss_CFLAGS}"
+          LIBS="${LIBS} ${libnss_LIBS}"
+      fi
 
-    AC_CHECK_HEADER(sechash.h,NSS="yes",NSS="no")
-    if test "$NSS" = "yes"; then
-        if test "$with_libnss_libraries" != "no"; then
-            LDFLAGS="${LDFLAGS}  -L${with_libnss_libraries}"
-        fi
+      if test "$with_libnss_includes" != "no"; then
+          CPPFLAGS="${CPPFLAGS} -I${with_libnss_includes}"
+      fi
 
-        AC_CHECK_LIB(nss3, HASH_Begin,, NSS="no")
+      AC_CHECK_HEADER(sechash.h,NSS="yes",NSS="no")
+      if test "$NSS" = "yes"; then
+          if test "$with_libnss_libraries" != "no"; then
+              LDFLAGS="${LDFLAGS}  -L${with_libnss_libraries}"
+          fi
 
-        if test "$NSS" = "no"; then
-            echo
-            echo "   ERROR!  libnss library not found, go get it"
-            echo "   from Mozilla or your distribution:"
-            echo
-            echo "   Ubuntu: apt-get install libnss3-dev"
-            echo "   Fedora: yum install nss-devel"
-            echo
-            exit 1
-        fi
+          AC_CHECK_LIB(nss3, HASH_Begin,, NSS="no")
+
+          if test "$NSS" = "no"; then
+              echo
+              echo "   ERROR!  libnss library not found, go get it"
+              echo "   from Mozilla or your distribution:"
+              echo
+              echo "   Ubuntu: apt-get install libnss3-dev"
+              echo "   Fedora: yum install nss-devel"
+              echo
+              exit 1
+          fi
 
-        AC_DEFINE([HAVE_NSS],[1],[libnss available for md5])
-        enable_nss="yes"
+          AC_DEFINE([HAVE_NSS],[1],[libnss available for md5])
+          enable_nss="yes"
+      fi
     fi
 
   # libmagic